The difference between the two frequencies used in the operation of a cell phone is [tex]\( 1.224 \times 10^9 \) Hz.[/tex]
To calculate the difference between the frequencies, we first need to find the frequencies of the waves emitted by the base unit and the phone. We can use the formula [tex]\( v = f \times \lambda \)[/tex] , where [tex]\( v \)[/tex] is the speed of light, [tex]\( f \)[/tex] is the frequency, and [tex]\( \lambda \)[/tex] is the wavelength.
Given:
Speed of light, [tex]\( v = 2.9979 \times 10^8 \)[/tex] m/s
Wavelength of base unit, [tex]\( \lambda_{base} = 0.34394 \) m[/tex]
Wavelength of phone, [tex]\( \lambda_{phone} = 0.36140 \) m[/tex]
First, let's find the frequency of the wave emitted by the base unit:
[tex]\[ f_{base} = \frac{v}{\lambda_{base}} = \frac{2.9979 \times 10^8}{0.34394} \]\[ f_{base} = 8.720 \times 10^8 \text{ Hz} \][/tex]
Next, let's find the frequency of the wave emitted by the phone:
[tex]\[ f_{phone} = \frac{v}{\lambda_{phone}} = \frac{2.9979 \times 10^8}{0.36140} \]\[ f_{phone} = 8.288 \times 10^8 \text{ Hz} \][/tex]
Now, we can find the difference between the frequencies:
[tex]\[ \Delta f = |f_{base} - f_{phone}| = |8.720 \times 10^8 - 8.288 \times 10^8| \]\[ \Delta f = 1.224 \times 10^8 \text{ Hz} \][/tex]
So, the difference between the two frequencies used in the operation of a cell phone is [tex]\( 1.224 \times 10^8 \) Hz, or \( 122.4 \text{ MHz} \).[/tex]
Complete Question:
Two radio waves are used in the operation of a cellular telephone. To receive a call, the phone detects the wave emitted at one frequency by the transmitting station or base unit. To send your message to the base unit, your phone emits its own wave at a different frequency. The difference between these two frequencies is fixed for all channels of cell phone operation. Suppose the wavelength of the wave emitted by the base unit is 0.34394 m and the wavelength of the wave emitted by the phone is 0.36140 m. Using a value of 2.9979 108 m/s for the speed of light, determine the difference between the two frequencies used in the operation of a cell phone.
The frequency difference between the waves emitted by the base unit and the phone is calculated by determining each frequency and subtracting them. The resulting difference is 42.1 MHz.
Calculating the Frequency Difference for Cellular Phone Signals
To determine the difference in frequencies between the wave emitted by the base unit and the wave emitted by the phone, we use the relationship c = fλ, where c is the speed of light (2.9979 × 108 m/s), f is the frequency, and λ is the wavelength.
Step-by-Step Calculation
Step 1: Calculate the frequency of the wave emitted by the base unit.
[tex]f_{base} = c / \lambda_{base}\\f_{base} = 2.9979 × 10^8 m/s / 0.34394 = 8.714 \times 10^8 Hz[/tex]
Step 2: Calculate the frequency of the wave emitted by the phone.
[tex]f_{phone} = c / \lambda _{phone} \\f_{phone} = 2.9979 \times 10^8 m/s / 0.36140 = 8.293 \times 10^8 Hz[/tex]
Step 3: Find the difference between the two frequencies.
[tex]\Delta f = f_{base} - f_{phone} \\\Delta f = (8.714 \times 10^8 Hz) - (8.293 \times 10^8 Hz)\Delta f = 4.21 \times 10^7 Hz[/tex]
The difference between the two frequencies used in the operation of the cell phone is [tex]4.21 \times 10^7 Hz[/tex] or 42.1 MHz.
How many liters of blood does an adult heart pump every minute of every day?
it can be 5 to 7. :)
Scientists have found ancient rock formations dating to the late Proterozoic eon in South America. These ancient rocks can be found from the eastern edge of South America's continental shelf, which extends just off the coast of Brazil, to the interior of the continent. This general location is indicated by a green circle on the map below.
Scientists have also found rock formations made out of the same type of rock and from the very same eon at another location. The location of this second group of rock formations strongly supports the current theory of plate tectonics.
Where is the second rock formation most likely located?
Answer: Australia
Explanation:
Answer:
that not the answer the answer is off the cost of Africa
Explanation:
What is the relationship between mass weight and gravity
Answer:
Let's start by defining what is mass, gravity and weight:
The mass is the amount of matter that exists in a body, which only depends on the quantity and type of particles within it. This means mass is an intrinsic property of each body and remains the same regardless of where the body is located.
Gravity is an attraction force, which depends on the mass of the bodies and their distance.
Weight is the force that gravity exerts on matter and changes depending on where the body is located. Therefore, the weight of an object on Earth will not be the same as the weight of the same object on the Moon or on Mars.
Now, according to Newton's law of Gravitation, the force [tex]F[/tex] exerted between two bodies of masses [tex]m1[/tex] and [tex]m2[/tex] and separated by a distance [tex]r[/tex] is equal to the product of their masses and inversely proportional to the square of the distance:
[tex]F=G\frac{(m1)(m2)}{r^2}[/tex] (1)
Where [tex]G[/tex]is the gravitational constant
In the case of our Earth, its mass [tex]m1[/tex] and radius (distance [tex]r[/tex] from its center to its surface where an object is) are constant. So, we can write all these constant in one, in the following way:
[tex]g=G\frac{m1}{r^2}[/tex] (2)
Where [tex]g[/tex] is the gravity force on Earth and its value is [tex]9.8\frac{m}{{s}^2}[/tex]
.
Rewriting equation (1) with this consideration:
[tex]F=g.m_{2}[/tex] (3)
Where [tex]F=W[/tex] is known as the weight:
[tex]W=g.m[/tex] (4)
Here we can see the relationship among mass [tex]m[/tex] , weight [tex]W[/tex] and gravity [tex]g[/tex]
Mass is a measure of the amount of matter in an object and is constant regardless of location. Weight, however, is a measure of the gravitational force acting on an object, varying with the force of gravity. Although often used interchangeably in everyday language, these concepts are distinct in physics.
Explanation:Mass, weight, and gravity are closely related but distinct concepts in physics.
Mass is the quantity of matter in an object and does not change regardless of the object's location. It refers to how much 'stuff' an object is made of, measured typically in kilograms.
Weight, on the other hand, refers to the force that gravity exerts on an object. It is directly proportional to the object's mass and the acceleration due to gravity and is measured in newtons. Therefore, an object's weight can change depending on the gravitational force it experiences.
For example, an astronaut's mass remains the same whether she is on Earth or the moon. However, her weight changes, being only one-sixth on the moon of what it is on Earth because the moon's gravity is only one-sixth that of Earth's.
In conclusion, though often used interchangeably in everyday language, weight and mass are very different with weight being dependant on the force of gravity.
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There is a repulsive force between two charged objects when
When two electrically charged bodies come closer, appears a force that attracts or repels them, depending on the sign of the charges of this two bodies.
This is stated by Coulomb's Law:
"The electrostatic force [tex]F_{E}[/tex] between two point charges [tex]q_{1}[/tex] and [tex]q_{2}[/tex] is proportional to the product of the charges and inversely proportional to the square of the distance [tex]d[/tex] that separates them, and has the direction of the line that joins them"
Mathematically this law is written as:
[tex]F_{E}= K\frac{q_{1}.q_{2}}{d^{2}}[/tex]
Where [tex]K[/tex] is a proportionality constant.
Now, if [tex]q_{1}[/tex] and [tex]q_{2}[/tex] have the same sign charge (both positive or both negative), a repulsive force will act on these charges.
A 120 kg Santa Claus slides down a 9 m chimney. He drops from his sleigh 2 m above the top of the chimney. It’s a tight fit, but he slides the whole way. He just comes to rest as he reaches the hearth. What is the force of friction on Santa from the chimney?A) 750 NB) 2000 NC) 2500 ND) 3200 NE) 1500 N
Answer:
E) 1500 N
Explanation:
The total height from which Santa has fallen down is
h = 9 m + 2 m = 11 m
So its gravitational potential energy at the beginning was
[tex]U=mgh=(120 kg)(9.81 m/s^2)(11 m)=12,949 J[/tex]
While sliding down, Santa has lost all its gravitational potential energy: this energy has been converted into thermal energy due to the presence of the friction. So, the work done by friction is exactly equal to the initial potential energy of Santa:
[tex]W=12,949 J[/tex]
The work done by friction is
[tex]W=Fd[/tex]
where
F is the force of friction
d = 9 m is the length of the chimney (the distance through which the frictional force acts)
Solving the equation for F, we find
[tex]F=\frac{W}{d}=\frac{12,949 J}{9 m}=1439 N[/tex]
So the closest option is
E) 1500 N
Describe the type of radioactive emission produced from the decay of carbon-14 to nitrogen-14 and predict its reaction to an electric field.
Answer:
A beta emission(negatron)
Explanation:
1. A negatron resembles an orbital electron. It is represented as β⁻.
A negatron has a mass number of 0 but with a charge of -1
The decay of C-14 to N-14 can be depicted below:
¹⁴₆C → ¹⁴₇N + ₋₁⁰e
Both the mass number and atomic number is balanced according to the reaction.
2. In an electric field, the emission produced would be deflected towards the positive pole because it is negatively charged.
Beta radioactive emission
During this radioactive decay, Beta charges are released. These negative particles tend to be attracted to the positive plate in the electric field.
The radioactive decay of C-14 produces a N-14 atom through the emission of Beta particles.
The Beta particles are negatively charged and would be attracted to the positive plate in the electric field because according to law of charges, like charges will tend to repel each other while unlike charges will attract each other.
Technician a says that shims are sometimes used to adjust camber. technician b says that shims can sometimes be used to adjust caster. who is correct?
I'll have to be honest with you. I've read both of those opinions several times, carefully, and it looks to me like both technicians are saying exactly the same thing.
Now, my knowledge of shims and camber is limited (to approximately zero), so all I can say to answer the question is this: If EITHER technician is correct, then they're BOTH correct.
Shims are used to adjust camber, not caster.
Explanation:Technician A is correct. Shims are sometimes used to adjust camber in vehicles. Camber refers to the angle of the wheels relative to the vertical axis when viewed from the front or rear of the vehicle. Shims are thin metal or plastic pieces inserted between the suspension components and the vehicle frame to adjust the camber angle.
Technician B is incorrect. Shims are not used to adjust caster in vehicles. Caster refers to the angle of the steering axis when viewed from the side of the vehicle. Caster is typically adjusted by changing the position of the control arms or using adjustable suspension components.
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12. The Copernican model of the universe was supported by A. Brahe and Kepler. B. Ptolemy and Brahe. C. Kepler and Einstein. D. Ptolemy and Kepler.
Answer:
A. Brahe and Kepler
Explanation:
The Copernican model was a heliocentric model of the universe. Copernicus thought that the Sun is stationary, and the Earth and the other planets are orbiting around it. He also noted that the stars are further away from the Sun compared to the distance between the Earth and the Sun. Three very important hings in his theory are that he thought that the Earth rotates around its own axis, revolves around the Sun, and has annual tilting of its axis. At some things, Copernicus was right with his theory, at some he wasn't, but anyway he made one giant step forward in the understanding of the universe. His theory was supported by many, though mostly after his death, with one of the most noticeable supporters of him being Ticho Brache and Kepler who made model of his theory, as well as improving it.
Answer:
The correct answer will be option A- Brahe and Kepler.
Explanation:
Copernicus presented his heliocentric model of the solar system in 1543 which stated that the sun is present at the center with all planets revolving around it.
This model was supported by the works of Tycho Brahe who also said that sun is the center of the earth and Johannes Kepler who gave the laws related to the motion of the planetary objects with the sun at the center.
Thus, option A- Brahe and Kepler is the correct answer.
Who is the founder of operant conditioning?
Operant conditioning, sometimes called instrumental learning, was first extensively studied by Edward L. Thorndike, who observed the behavior of cats trying to escape from home-made puzzle boxes.
Hope this helps!
Check all choices below that are correct. Increasing the frequency increases the current. Changing the frequency does not affect the current. Voltage leads current. Current and voltage are in phase. Changing ΔVmax does not affect the current. Changing the resistance does not affect the current. Increasing ΔVmax decreases the current. Increasing the resistance increases the current. Increasing the resistance decreases the current. Increasing ΔVmax increases the current. Current leads voltage. Increasing the frequency decreases the current.
Answer:
the experyoeyv
Explanation:
EACH of these statements CAN be true or false. They ALL depend on the situation, and on the components of the particular circuit.
For each of these statements, I can give you the diagram of a circuit in which the statement is true, and I can give you the diagram of another circuit in which the same statement is false.
These choices are usually true:
-- Changing the frequency does not affect the current.
-- Increasing the resistance decreases the current.
-- Increasing ΔVmax increases the current.
These choices are usually false:
-- Increasing the frequency increases the current.
-- Changing ΔVmax does not affect the current.
-- Changing the resistance does not affect the current.
-- Increasing ΔVmax decreases the current.
-- Increasing the resistance increases the current.
-- Increasing the frequency decreases the current.
These choices can go either way just as easily:
-- Voltage leads current.
-- Current and voltage are in phase.
-- Current leads voltage.
The main ingredients of most satellites of the jovian planets are
Answer:Hydrogen and Helium.
Explanation:
Answer:
hydrogen compound ices.
Explanation:
the amplitude of a sound wave is related to which property?
A.Speed
B.Volume
C.Pitch
D.Wavelength
Answer:
B
Explanation:
The higher the volume, the higher the amplitude of the sound wave. This is because the sound wave is being converted to electricity. The higher the vibrations the higher the current it is induced. Changes in the amplitude of a particular wave do not change its wavelength or frequency. This is observable in an oscilloscope.
Answer:
Volume
Explanation:
During the day, when the Sun is shining, the ground gets warm mainly as a result of...
heat from Earth's core being conducted to Earth's surface.
convection currents in the atmosphere heating the ground.
radiated heat from the Sun being absorbed by the ground.
the emission of greenhouse gases from factories and vehicles.
Answer:
radiated heat from the Sun being absorbed by the ground
Answer: radiated heat fron the Sun being absorbed by the ground.
Explanation: During the day the Sun is "shining", this means that the sun is "emanating" electromagnetic waves (some in form of visible light, this is why in the day we can see a lot of light) that reach us in the Earth. Those electromagnetic waves carry with a lot of energy, and when they impact the ground, they transmit that energy in form of heat. This "transmission" of temperature is called "radiation", so the correct option is the third one; radiated heat from the Sun is absorbed by the ground.
Consider two identical microscope slides in air illuminated with monochromatic light. the bottom slide is rotated (counterclockwise about the point of contact in the side view) so that the wedge angle gets a bit smaller. what happens to the fringes
Answer:
Explanation:ruhfu
Final answer:
When the bottom microscope slide is rotated to make the wedge angle smaller while illuminated with monochromatic light, the interference fringes observed due to thin film interference become more closely spaced due to the more uniform air layer thickness.
Explanation:
When considering two identical microscope slides in air illuminated with monochromatic light, if the bottom slide is rotated counterclockwise about the point of contact in the side view so that the wedge angle gets a bit smaller, the fringes observed would change. These fringes are a result of thin film interference, a phenomenon where light waves that reflect off the different layers of a thin film interfere with each other, creating a pattern of bright (constructive interference) and dark (destructive interference) bands.
As the wedge angle decreases, the thickness of the air layer between the two slides changes more uniformly across the length of the slides. This uniformity in thickness leads to a more regular pattern of interference fringes. The fringes would become more closely spaced as the wedge angle decreases because the path difference between the light reflecting off the top and bottom surfaces of the air wedge changes more gradually. If the slides eventually become parallel, the fringes would theoretically form an infinitely fine pattern, but practically, the fringes would disappear as the condition for constructive or destructive interference would no longer be met in a discernible pattern.
A lens forms an image of an object. The object is 16.0 cm from the lens. The image is 12.0 cm from the lens on the same side as the object.
(a) What is the focal length of the lens? Is the lens converging or diverging?
(b) If the object is 8.50 mm tall, how tall is the image? Is it erect or inverted?
(c) Draw a principal-ray diagram.
(a) -48.0 cm, diverging
We can use the lens equation:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where
f is the focal length
p = 16.0 cm is the object distance
q = -12.0 cm is the image distance (with a negative sign because the image is on the same side as the object, so it is virtual)
Solving for f, we find the focal length of the lens:
[tex]\frac{1}{f}=\frac{1}{16.0 cm}+\frac{1}{-12.0 cm}=-0.021 cm^{-1}[/tex]
[tex]f=\frac{1}{-0.021 cm^{-1}}=-48.0 cm[/tex]
The lens is diverging, since the focal length is negative.
(b) 6.38 mm, erect
We can use the magnification equation:
[tex]\frac{y'}{y}=-\frac{q}{p}[/tex]
where
y' is the size of the image
y = 8.50 mm is the size of the object
Substituting p and q that we used in the previous part of the problem, we find y':
[tex]y'=-y\frac{q}{p}=-(8.50 mm)\frac{-12.0 cm}{16.0 cm}=6.38 mm[/tex]
and the image is erect, since the sign is positive.
(c)
See attached picture.
The focal length of a provided lens is -9.6 cm, indicating a diverging lens. The image formed is inverted and has a height of 6.375 cm.
To help you with this question, we will take advantage of the lens formula, 1/f = 1/v - 1/u, where f is the focal length, v is the image distance and u is the object distance.
We can also utilize magnification formula for lenses, which is M = -v/u = h'/h, where h' is the height of the image and h is the height of the object.
(a) To ascertain the focal length of the lens, we plug given u and v into lens formula. The image is on the same side as the object, thus v is regarded as negative. By substituting the supplied figures, we get f = -9.6 cm. As the focal length is negative, the lens is a diverging lens.
(b) The magnification M can be calculated using the provided dimensions of the object and image. Given that object height (h) is 8.5mm and rearranging the magnification formula to solve for image height, h' equals -v * h / u, and what we get is -6.375cm. Therefore, the image is 6.375cm tall and it is inverted as its height is negative.
(c) The image is provided below.
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central air conditioner uses 4.5 kilowatts. It runs for 5 hours over the course of a day. How much energy does the air conditioner use during that day? 9.5 kilowatt-hours 0.5 kilowatt-hours 0.9 kilowatt-hours 22.5 kilowatt-hours
Energy = (power) x (time)
Energy = (4.5 kW) x (5 hours)
Energy = (4.5 x 5) kW-h
Energy = 22.5 kW-h
Answer:
See below.
Explanation:
That would be 4.5 * 5 = 22.5 kilowatt hours.
In which city did the wright brothers take off on their very first flight
The Wright brothers, Wilbur and Orville, were pioneers of aviation, since they flew in a device heavier than air, which was inconceivable at that time.
Their first successful flight was on December 17th, 1903 in Kitty Hawk, North Carolina, which lasted only 12 seconds in which their plane (the Flyer I, with 341 kg, 6.4 m long and a wingspan of 12.3 m) traveled 37 m without touching the ground. This was achieved through the help of an external catapult that "threw" them into the air.
It should be noted that the Wright brothers only studied until high school, however, their passion for solving the problem of the human inability to fly, their perseverance and experience acquired over the years in their bicycle company, led them to reach that goal. An achievement that marked the beginning of the aviation era.
A pump, submerged at the bottom of a well that is 35 m deep, is used to pump water uphill to a house that is 50 m above the top of the well, as shown above. The density of water is 1,000 kg/m3. Neglect the effects of friction, turbulence, and viscosity. (a) Residents of the house use 0.35 m3 of water per day. The day’s pumping is completed in 2 hours during the day. i. Calculate the minimum work required to pump the water used per day ii. Calculate the minimum power rating of the pump. (b) In the well, the water flows at 0.50 m/s and the pipe has a diameter of 3.0 cm. At the house the diameter of the pipe is 1.25 cm. i. Calculate the flow velocity at the house when a faucet in the house is open. ii. Calculate the pressure at the well when the faucet in the house is open.
Answer:
0.45
Explanation:
Your friend says that inertia is a force that keeps things in their place, either at rest or moving at a constant speed. Do you agree?
Answer:
No
Explanation:
The error in the sentence is that inertia is not a force.
In fact, inertia is just the tendency of an object to keep its state of rest/motion if the net force acting on it is zero. As stated in Newton's First Law, also called Law of Inertia:
"An object at rest will remain at rest and an object in motion will continue its motion with constant velocity if the net force acting on it is zero"
This law basically tells us that as long as there are no forces acting on an object, the object mantains its state of rest/motion. On the contrary, in order to change the state of motion of an object, we need a net force different from zero.
Which radiation has no electric charge associated with it?
Gamma radiation has no electric charge associated with it.
Explanation:The radiation that has no electric charge associated with it is gamma radiation. Gamma radiation is a form of electromagnetic radiation that is extremely high in energy. It is emitted during radioactive decay or nuclear reactions and does not carry an electric charge.
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Gamma rays are the type of radiation that carries no electric charge. They are uncharged electromagnetic waves, unlike alpha and beta particles, which carry positive and negative charges respectively.
Explanation:The type of radiation that has no electric charge associated with it is gamma radiation or gamma rays. Unlike alpha and beta particles, gamma rays are neither positively nor negatively charged. They are electromagnetic waves that are uncharged. Alpha particles, carrying two protons, have a net charge of +2, and beta particles, carrying one electron, have a net charge of -1. On the hand, gamma rays, being solely photons or light, carry no charge. They remain unaffected by electric and magnetic fields, indicating their neutral charge.
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Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height of the shorter building.
htaller/hsmall=?
Answer:
4 times taller
Explanation:
The horizontal distance travelled by a projectile is
[tex]d=v_x t[/tex] (1)
where [tex]v_x[/tex] is the horizontal velocity (which is constant) and t is the total time of the fall.
The total time of the fall can be found by analyzing the vertical motion of the projectile: the vertical position at time t is given by
[tex]y= h - \frac{1}{2}gt^2[/tex]
where h is the initial height, g = 9.8 m/s^2 is the acceleration due to gravity, t is the time.
The total time of the fall is the time t at which y=0 (the projectile reaches the ground), so
[tex]0=h-\frac{1}{2}gt^2\\t=\sqrt{\frac{2h}{g}}[/tex]
Substituting into (1),
[tex]d= v_x \sqrt{\frac{2h}{g}}[/tex]
This can be re-arranged as
[tex]d^2 = v_x ^2 \frac{h}{2g}\\h = \frac{2gd^2}{v_x^2}[/tex]
so we see that the initial height depends on the square of the horizontal distance travelled, d.
In this problem, one stands lands twice as far as the other stone does, so
d' = 2d
this means that the height of the taller builing is
[tex]h' = \frac{2g(2d)^2}{v_x^2}=4(\frac{2gd^2}{v_x^2})=4 h[/tex]
so the taller building is 4 times taller than the smaller one.
Which sentence correctly describes a friction force? A. It acts in the same direction as the motion of an object. B. It acts in a direction opposite to the motion of an object. C. It acts in the same direction as the force of gravity on an object. D. It acts in a direction perpendicular to the motion of an object.
Answer:
B
Explanation:
Friction acts in a direction opposite to the motion of an object
Friction force acts in a direction opposite to the intended motion of an object. It depends on the coefficient of friction between the surfaces and the normal force exerted in response to gravity.
Explanation:In understanding the principles of Physics, the correct description of a friction force is that It acts in a direction opposite to the motion of an object. This phenomenon can be illustrated in several scenarios, such as a box sliding across a floor or objects moving on an inclined plane. In both cases, the friction force always opposes the motion of the object.
For instance, if a box is being pushed to the right, the frictional force works to the left. If an object has a component of its weight pulling it down an incline, the frictional force acts upward on the incline, opposing the intended motion.
It's important to note that the force of friction depends on two factors: the coefficient of friction between the two surfaces and the normal force exerted by the surface supporting the object in response to gravity. Furthermore, friction runs parallel to the surface between objects and perpendicular to the normal force.
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The car travels with constant acceleration reaching a speed of v m/s after 6 seconds.
The car then travels at a constant speed of v m/s for a further 2 seconds.
The car travels a total distance of 150 meters
Work out the value of Velocity
Answer:
Explanation:
time = 2s + 6s = 8s
distance = 150m
speed = ?
velocity = ?
speed = distance ÷ time
v = d / t
v = 150 / 8
v = 18,75 m/s
i'm not sure about velocity only the total speed
Final answer:
To determine the car's velocity, we broke down the journey into an acceleration phase and a constant velocity phase, used the kinematic equations to relate velocity, time, and distance, and solved the resulting equation to find that the velocity is approximately 13.64 m/s.
Explanation:
To find out the velocity of the car, we need to consider two phases of its journey: the acceleration part and the constant velocity part. First, let's assume the initial velocity is zero since it's not provided, and the car accelerates for 6 seconds to reach a velocity of v m/s.
During the acceleration phase, we use the equation [tex]s_{1}[/tex] = ut + (1/2)[tex]at^2[/tex], with u being the initial velocity and a being the acceleration. Here, the initial velocity u is 0, so [tex]s_{1}[/tex]= (1/2)[tex]at^2[/tex]. We don't directly know a, but we know the car reached a velocity of v after 6 seconds. For the acceleration, we use v = u + at, which gives us a = v/6 since u is 0.
Now, substituting this in the first equation, we get [tex]s_{1}[/tex] = (1/2)(v/6)*[tex]6^2[/tex] = 18v/2, therefore s1 = 9v. During the constant velocity phase, [tex]s_{2}[/tex] is easier to find as [tex]s_{2}[/tex] = vt, with t being 2 seconds, so [tex]s_{2}[/tex]= 2v. The total distance covered by the car s = [tex]s_{1} + s_{2}[/tex] = 9v + 2v = 11v.
Using the total distance of 150 meters given in the problem, we can write 150 = 11v, and solving for v we get v = 150/11, yielding a velocity of approximately 13.64 m/s.
Discuss the pros and cons of fission and fusion reactions.
Fission: -
Pros:
- "It does not contribute to the air pollutants in the environment."
- "It does not need costly energy fuels."
- "It is capable of providing energy for 2 to 3 years."
- "It does not make global warming worse."
- "It produces a nuclear reaction that is important."
- "It helps with the field of astronomy."
Cons:
- "It can harm the environment in a way that it disposes waste."
- "It poses a risk to public health."
- "It can cause deadly and costly accidents."
- "It has the potential to open the door for terrorists to create powerful weapons."
Fusion Reactions: -
Pros:
- "Clean energy ."
- "Virtually limitless fuel available ."
- "No chain reaction. Easier to control or stop than fission ."
- "Nuclear fission is either a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts (lighter nuclei) ."
- "Little or no nuclear waste. Core remains radioactive for only 100 years. Possibly radioactive structural elements ."
- "Very low fuel cost."
Cons:
- "Unproven (it will take another years of research to explore it on commercial scale) ."
- "Commercial power plants will be very expensive to build ."
- "Requires extremely high temperatures .
If cold fusion could be achieved, it would be much easier to implement."
Which color of visible light has the longest wavelength?
Answer: the answer is red which its wavelength is slighty longer than blues
Red light has the longest wavelength among visible colors.
Explanation:Red light has the longest wavelength among the colors of visible light. The main colors of visible light, from longest to shortest wavelength, can be remembered using the mnemonic ROY G BIV- Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Violet, on the other hand, has the shortest wavelength among the colors of visible light.
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Billy left some rocks outside in the Sun. After many hours, they got hot. When he went inside for the night, he left them outside. What will happen to the rocks as they stay out all night?
Answer:
they get cool
Explanation:
Billy left some rocks inside for the night. The rocks will be cooled as they stay out all night.
What is Hot and Cold?When the temperature of any object increases, it becomes hot. The same way, if the temperature decreases, it gets cold.
The sunlight carries the heat in the form of light rays. As they fall on the rock when kept outside in the Sun, they become hot. After the sunset, the surrounding temperature get down to the lowest. The temperature of the rock will also be decreased.
Thus, the rocks as they stay out all night, will get cold.
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A 100-g toy car is propelled by a compressed spring that starts it moving. the car follows a curved track. what is the final speed of the toy car if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude.
Answer:
0.687 m/s
Explanation:
Initial energy = final energy
1/2 mu² = mgh + 1/2 mv²
1/2 u² = gh + 1/2 v²
Given u = 2.00 m/s, g = 9.8 m/s², and h = 0.180 m:
1/2 (2.00 m/s)² = (9.8 m/s²) (0.180 m) + 1/2 v²
v = 0.687 m/s
The final speed of the toy car is about 0.687 m/s
[tex]\texttt{ }[/tex]
Further explanationLet's recall Kinetic Energy Formula as follows:
[tex]\large {\boxed{Ek = \frac{1}{2}mv^2} }[/tex]
Ek = Kinetic Energy ( Joule )
m = mass of the object ( kg )
v = speed of the object ( m/s )
Let us now tackle the problem !
[tex]\texttt{ }[/tex]
Given:
mass of toy car = m = 100 g
initial speed of toy car = u = 2.00 m/s
initial height position of toy car = h₁ = 0 m
final height position of toy car = h₂ = 0.180 m
Asked:
final speed of toy car = v = ?
Solution:
We will use Conservation of Energy to solve this problem:
[tex]Ep_1 + Ek_1 = Ep_2 + Ek_2[/tex]
[tex]mgh_1 + \frac{1}{2} m u^2 = mgh_2 + \frac{1}{2} m v^2[/tex]
[tex]0 + \frac{1}{2}mu^2 = mgh_2 + \frac{1}{2} m v^2[/tex]
[tex]\frac{1}{2}u^2 = gh_2 + \frac{1}{2}v^2[/tex]
[tex]u^2 = 2gh_2 + v^2[/tex]
[tex]v^2 = u^2 - 2gh_2[/tex]
[tex]v = \sqrt {u^2 - 2gh_2}[/tex]
[tex]v = \sqrt {2.00^2 - 2(9.8)(0.180)}[/tex]
[tex]v \approx 0.687 \texttt{ m/s}[/tex]
[tex]\texttt{ }[/tex]
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Answer detailsGrade: High School
Subject: Physics
Chapter: Energy
which type of magnet is created from an electromagnet
a) permanent
b) temporary
c) variable
d) rotating
I think the answer is c
Name three categories that are used to classify the elements in the periodic table?
Answer:
metals,nonmetals, and inert gases
Explanation:
Metals, non-metal and noble gases are the three categories useful for classifying the elements in periodic table.
Explanation:
Elements are defined as a vertical group and a horizontal period in periodic table. Metals, non-metal and noble gases are the three categories useful for classifying the elements in periodic table.
A large number of elements in periodic table flow under the Metals category. Non-metal in the table are mostly gaseous. Noble gases in the table are colorless and non-reactive.
The law prohibits a person from _________ an electric vehicle/"ev"-designated parking space.
Answer:
The law prohibits a person from barring access to an electric vehicle/"ev"-designated parking space.
Final answer:
The law prohibits a person from occupying an EV-designated parking space unless they are driving an electric vehicle. Improper usage of such spots results in fines, similar to other regulated parking spots. Laws exist to maintain public safety and order, including regulations on parking and driving practices.
Explanation:
The law generally prohibits a person from occupying or parking in an electric vehicle (EV)-designated parking space unless the vehicle is an electric vehicle. Misuse of such designated parking spots, similar to those reserved for handicapped persons or pregnant women, can result in fines or legal penalties.
This is akin to the example where parking in a handicapped spot resulted in a police officer issuing a ticket, implying that the action was prohibited and enforceable by law. Additionally, company policies, such as the one that was violated when a truck was parked front-end first in a fleet yard, can also dictate proper parking practices that must be adhered to avoid repercussions.
Related to similar legal boundaries, new legislation often aims to enhance public safety and order, as in the case with laws against texting while driving. Ignoring such laws not only endangers others but is also a subject to legal action. As society evolves, the creation of new laws and the modification of existing ones ensure that ethical and safety standards are maintained in all aspects of daily life, including the use of public spaces and adherence to road safety guidelines.