v=v2-v1=15-10=5 cm/s
p=mv=0.15•5=0.75 kg•cm/s
Answer : The correct option is, (A) 7.5 mN.s
Explanation :
Impulse : It is defined as the force applied to an object for a certain amount of time.
Formula used :
[tex]I=F\times \Delta t[/tex]
As we know that:
[tex]F=m\times \Delta a\\\\\Delta a=\frac{\Delta v}{\Delta t}[/tex]
Thus, formula of impulse will be:
[tex]I=m\times \Delta v[/tex]
where,
I = impulse = ?
m = mass = 0.15 kg
[tex]\Delta v[/tex] = change in speed of velocity = [tex]v_{final}-v_{initial}=15cm/s-10cm/s=5cm/s=0.05m/s[/tex] (1 m = 100 cm)
Now put all the given values in the above formula, we get:
[tex]I=(0.15kg)\times (0.05m/s)[/tex]
[tex]I=0.0075kg.m/s=0.0075N.s=7.5mN.s[/tex] (1 N.s = 1000 mN.s)
Therefore, the impulse acting on the car is, 7.5 mN.s
how much energy is used when the incandescent bulb is left on for 12 hours
You haven't told us the "wattage" rating of the bulb. We'll just have to call it ' W ' .
The bulb uses energy at the rate of W watts, or 0.001W kilowatts.
In 12 hours, it uses 0.012W kilowatt-hours of energy.
= = = = =
W watts = W Joules/second
1 hour = 3600 seconds
12 hours = (12 x 3600) seconds
Energy = (W Joule/sec) x (12 x 3600 sec)
Energy = 43,200W Joules
Final answer:
The energy used by a 100W incandescent bulb is 4,320,000 joules
Explanation:
Calculating Energy Use of an Incandescent Bulb
To calculate the energy used by an incandescent bulb left on for 12 hours, we need to know the power rating of the bulb. However, if we take a typical 100W incandescent bulb as an example, we can use the formula for electrical energy (Energy = Power *Time) to find out the energy consumption in watt-hours (Wh) and then convert it to joules (J). The power rating is usually mentioned on the bulb itself.
For a 100W bulb left on for 12 hours:
Energy in watt-hours = Power*Time
Energy in watt-hours = 100 W * 12 h = 1200 wh
Since 1 watt-hour is equal to 3600 joules,
Energy in joules == 4320000 J
Therefore, a 100W incandescent bulb uses 4320000 joules of energy when left on for 12 hours.
An object with a mass of 70 kilograms is supported at a height of 8 meters above the ground, what's the potential energy of the object with respect to the ground?
Answer:
5488 Joules
Explanation:
Use the formula for the potential energy:
[tex]E_p = mgh = 70kg\cdot 9.8\frac{m}{s^2}\cdot 8m = 5488 J[/tex]
While studying balanced and unbalanced forces, Jose and Gina test what they have learned by Jose applying 10 Newtons of forces to one side of a box and Gina applying 8 Newtons of force to the other side of the box.
A. The box does not move.
B. The box moves toward Gina.
C. The box moves toward Jose.
D. The force crumples the box.
The answer will be letter B.
Answer:
b
Explanation:
the box moves toward gina
Which gas in Earth’s atmosphere forms ozone?
oxygen
nitrogen
water vapor
carbon dioxide
Which characteristics describe the troposphere? Check all that apply.
is the innermost layer
contains the ozone layer
has the highest air pressure
spans 12–50 km above Earth
is a good place for planes to fly
Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?
oxygen
nitrogen
water vapor
carbon dioxide
Which phrases describe air density? Check all that apply.
increases as altitude increases
equals mass divided by volume
pushes molecules in one direction
exerts more pressure as it increases
measures how tightly molecules are packed
Answer:
1) Oxygen 2) So The Troposphere is a good place for planes to fly. 3) [tex]CO_{2}[/tex] 4) It measures how tightly molecules are packed, It pushes molecules in one direction
Explanation:
1) Which gas in Earth’s atmosphere forms ozone?
Oxygen since Ozone is formed when [tex]O_{2} [/tex] receives Ultraviolet in its energetic form[tex] O_{3}[/tex], in a process called photolise.
2) Which characteristics describe the troposphere? Check all that apply.
This layer is the closest to the Earth although it is thicker in the Equator. Most planes fly in there.
So The Troposphere is a good place for planes to fly.
3) Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?
The outcome burning of fossil fuels is among other gases is the [tex]CO_{2}[/tex]
4) Which phrases describe air density?
Although these are not precise descriptions:
It measures how tightly molecules are packed The more density the more molecules are packed in given volume.
It pushes molecules in one direction, In a column of air the more the altitude the more molecules are pushed into the lower altitude region.
Devon places sliced potatoes in a package of aluminum foil. He puts a metal grate over a campfire and sets the package on the grate. He warms his hands over the fire while he waits and watches the hot air carry ashes into the sky. When he removes the foil package, the grate and foil are hot, and the food is cooked.
Which part of this scenario represents conduction?
The food cooks inside the foil.
Devon warms his hands over the fire.
The hot air rises into the sky.
The grate is hot when Devon is done cooking.
Answer: The correct answer is "The food cooks inside the foil".
Explanation:
In conduction , there is no actual movement of matter. Heat flows from the hotter body to the colder body but when the two bodies are placed in contact with each other.
In convection, there is a physical movement of matter.
Radiation is the emission of the energy. Heat travels through a vacuum in the radiation.
In the given problem, Devon places sliced potatoes in a package of aluminum foil. He puts a metal grate over a campfire and sets the package on the grate.
When he removes the foil package, the grate and foil are hot, and the food is cooked. Here, the heat is transferred from the campfire to the metal grate to the aluminium fire and then to the food. The metal grate and the aluminium foil are in contact with each other. Here, the conduction takes place.
Therefore, the scenario, "The food cooks inside the foil" represents the conduction from the given option.
Answer:
the food makes contact with the foil wich represents conduction so the answer is A, hope this helps ( ;w;)
Explanation:
what is the tension force law and how can i solve (c)?
The enclosed may help ....
Final answer:
The tension force is the force transmitted through a flexible connector, like a rope or cable, when it is pulled on both ends. To solve for the tension force, consider the forces acting on the object connected by the rope and apply Newton's laws of motion.
Explanation:
In physics, tension force refers to the force that is transmitted through a flexible connector, such as a rope or a cable, when it is pulled on both ends.
To solve for the tension force, you need to consider the forces acting on the object connected by the rope or cable. This can be done by applying Newton's laws of motion.
For example, if you know the weight of the object and the angle at which the rope or cable is inclined, you can use trigonometry to calculate the tension force.
A skydiver jumps from a helicopter hovering at high altitude.if there were no air resistance, how fast would she be falling 12s after jumping?
Well, if there were no air resistance, then a helicopter couldn't fly. But let's do the physics and the Math anyway:
The way gravity works, the speed of a falling object increases at the rate of 9.8 m/s every second.
So, after falling for 12 seconds, its speed is (12 x 9.8) = 117.6 m/s .
After 12 seconds of her jump from th helicopter, her velocity would be 117.6 m/s.
What are the second and third equations of motion?The second and third equations of motion are -
S = ut + 1/2 at²
v² - u² = 2aS
Given is a skydiver who jumps from a helicopter hovering at high altitude.
We can write -
[a] = 9.8 m/s²
[t] = 12 s
[u] = 0 m/s
Using the second equation of motion, we get -
S = ut + 1/2 at²
S = 1/2 at²
putting values -
S = 1/2 x 9.8 x 12 x 12
S = 705.6 m
Using the third equation of motion, we get -
v² - u² = 2aS
v² = 2aS
putting values -
v² = 2 x 9.8 x 705.6
v² = 13829.7
v = 117.6 m/s
Therefore, after the 12 seconds of her jump from the helicopter, her velocity would be 117.6 m/s.
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A 0.5-kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs for a time duration of 0.01 s, then the average force (magnitude only) acting upon the ball is ____ Newtons.
Given that:
mass of the ball (m) = 0.5 Kg ,
ball strikes the wall (v₁) = 5 m/s ,
rebounds in opposite direction (v₂) = 2 m/s,
time duration (t) = 0.01 s,
Determine the force (F) = ?
We know that from Newton's II law,
F = m. a Newtons
(velocity acting in opposite direction, so a = ( (v₁ + v₂)/t
= m × (v₁ + v₂)/t
= 0.5 × (5 + 2)/0.01
= 350 N
The force acting up on the ball is 350 N
what is the adaptation to the arctic fox
The Arctic fox is well adapted to its environment with seasonal coat color changes for camouflage and longer, denser winter fur for insulation against the cold.
The Arctic fox is a highly adapted species that thrives in the cold climates of the Arctic region. These foxes have developed several adaptations that make them well-suited for survival in their environment. Changing coat color with the seasons is one such adaptation, allowing Arctic foxes to maintain camouflage against snowy backgrounds in winter and rocky terrains in other seasons.
Furthermore, the longer fur that these animals grow in winter helps them to trap heat more effectively, ensuring they stay warm despite the freezing temperatures. This fur is not just longer, but also denser, adding an extra layer of insulation. Such physical adaptations, alongside behavioral ones like burrowing and hunting tactics, have equipped Arctic foxes to be masterful inhabitants of their harsh and unrelenting environment.
A 20kg boy on a 5 kg skateboard coasts to a rest from a speed of 4.5m/s while traveling a distance of 20m on the sidewalk. Draw a free body diagram for this situation and calculate the acceleration of the skateboard, the force of friction on the skate board and the coefficient of friction between the skateboard and the sidewalk.
Answer:
a = -.51 m/s²
coefficient of friction = .05
fk= 12.25 N
Explanation:
mass = 20 + 5kg
weight = 25kg ·9.8 = 245 N
There are many ways to do this I am sure but I did this:
1. found a by using vf²=vi²-2aΔx. accel is - because it is slowing down.
started at 4.5 m/s, final = 0 and Δx=20....a=-.51 m/s²
2. the force acting on the object is the friction force which has to equal the mass(accel).
-fk (going to left on free body diagram) = ma
-mu·n = ma
-mu·245N = 25 (-.51)
mu=.05
fk= .05(245N) = 12.25 N
The kinematics and Newton's second law allow to find the results for the questions of the movement of the child and the skateboard are:
a) the deceleration is a = 0.51 m / s²
b) The friction force is: fr = 12.75 N
c) The friction coefficient is equal to: μ = 0.052
Given parameters
The child's mass M = 20 kg. The mass of the skateboard m = 5 kg. Initial velocity vo = 4.5 m / s. The distance traveled x = 20 m.To find
a) Acceleration.
b) The friction force.
c) The coefficient of friction.
a) Kinematics studies the movement of bodies, finding relationships between their position, speed and acceleration.
Since the child ends up at rest, his final velocity is zero (v = 0), let's use the relation.
v² = v₀² - 2 a x
0 = v₀² - 2ax
a = [tex]\frac{v_o^2}{2x}[/tex]
a = [tex]\frac{4.5^2 }{2 \ 20}[/tex]
a = 0.51 m / s²
b) Newton's second law states that the net force is proportional to the product of the mass and the acceleration of the body.
A free-body diagram in a diagram of the forces without the details of the body, in the attached we can see the free-body diagram of the system.
Let's write Newton's second law, since the boy and the scooter do not separate, we use the total mass.
y-axis
N-W = 0
N = W
N = (M + m) g
N = (20 +5) 9.8
N = 245 N
x-axis
fr = [tex]m_{total} \ a[/tex]
Fr = (20+ 5) 0.51
fr = 12.75 N
c) Friction force is a macroscopic force of the interactions between the two surfaces and has the formula.
fr = μ N
μ = [tex]\frac{fr}{N}[/tex]
μ = 12.75 / 245
μ = 0.052
In conclusion, using kinematics and Newton's second law we can find the results for the questions of the movement of the boy and the skateboard are:
a) The deceleration is a = 0.51 m / s²
b) The friction force is: fr = 12.75 N
c) The friction coefficient is equal to: μ = 0.052
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Why will interference occur
Two waves interfere when they run into each other.
The barrier reflects waves that run straight into it. It acts as a wave source and sends wave pulses back up the page towards the incoming waves.
Imagine a loose string tied to a wall. Someone sends two consecutive pulses along the string towards the wall. The first pulse gets reflected right away. It will travel backward towards the person holding the string. Along its way, it will run into the second pulse. The two pulses will interfere. The wall will make the reflected pulse out of phase with the second one. They will end up creating a destructive interference.
So is the case with the water waves running into the barrier. The barrier will send incoming waves back toward where they came from. Reflected waves interfere with incoming ones.
Which of the following shows a car holding a steady speed
The answer is the velocity that is in a straight horizontal line.
The second one as the velocity doesn't change over time.
Current that moves in one direction from negative to positive. May be created by a battery. Is generally NOT found in U.S. electrical outlets. Which type of current is described by these statements?
Answer:
The type of current described by the given statements is D.C. (or direct Current).
Explanation:
There are two different types of currents. They are Alternating Current (AC) and Direct current (DC) . Alternating current varies alternately, as the name suggests. DC is used for devices that need low voltage, like the chargers of a mobile phone. Domestic power supply is AC .
The type of current described by these statements is direct current (DC).
Explanation:The type of current described by these statements is direct current (DC). Direct current flows in one direction from the negative terminal to the positive terminal. It is commonly created by batteries. However, it is generally not found in U.S. electrical outlets, which typically provide alternating current (AC). Alternating current changes direction periodically.
Direct current (DC) is an electric current that flows consistently in one direction. In a DC circuit, electrons move from the negative terminal to the positive terminal of a voltage source, such as a battery. DC is used in many electronic devices while alternating current (AC) periodically changes direction and is typically used for power distribution.
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Which of the following best expresses power? A. Power is work.
B. Power is the rate at which work is done.
C. Power is determined by mass.
D. Power is determined by work and mass.
Answer: option B: Power is the rate at which work is done.
Explanation:
Power can be defined as the amount of work done or amount of energy transferred in a unit time.
[tex]P = \frac{W}{t}[/tex]
Its unit is J/s.
SI unit of power is kg⋅m²⋅s⁻³
Hence, the best expression of power out of the given options is rate at which work is done. Option B is correct.
Which of following scientists helped lay the groundwork for the development of the concept of gravity by claiming the the sun, not earth, was at the center of the universe
Nicolaus Copernicus
Nicolaus Copernicus is the scientist who put forward a model which placed sun instead earth as the center of the universe
Which of he following injuries include instability of the knee with pain and swelling?
Hi there,
the following injuries that include instability of the knee with pain and swelling is ACL Tear.
The ACL tear is common especially in sports like football one wrong move and you fall and tear your ACL
Hope this helped :)
Have a great day
What is the SI unit for momentum
The impulse of the material point is equal to the product of mass and its velocity.
The unit of measurement of the imouls is:
[P] = [m] * [v] = kg * m / s.
Answer:
kg·m/s
Explanation:
The momentum of a body is calculated according to the following formula.
momentum = mass * velocity
Since the SI unit unit for mass is kilogram and the SI unit for velocity is metres/second then the multiplication of both will, algebraically give kg·m/s
A pendulum makes 36 vibrations in 60 seconds, what is its: Period? And Frequency
Answer:
Period = 1.67 seconds
Frequency = 0.6 Hz
Explanation:
Number of vibrations in 60 seconds = 36
Frequency is defined as vibrations per second.
So, Frequency = 36/60 = 0.6 Hz
Time period is defines as time taken for 1 vibration,
So, Time period = 60/36 = 1.67 seconds.
The period of vibration of a simple pendulum is 1.67 s.
The frequency of vibration of a simple pendulum is 0.6 Hz.
What is frequency of vibration?The frequency of vibration of a simple pendulum is the number of complete oscillation of the pendulum per second.
F = n/t
where;
n is number of vibrationst is time of vibrationF = 36/60
F = 0.6 Hz
What is period of vibration?The period of vibration is the inverse of frequency of vibration.
T = 1/f
T = 1/0.6
T = 1.67 s
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A car is pulled with a force of 10,000 N. The car's mass is 1267 kg. But, the car covers 394.6 m in 15 seconds
[a]What is the expected acceleration of the car from 10,000 N force?
[b]What is the actual acceleration from the observed data of x and t?
[c]What is the difference in accelerations?
[d]What force caused this difference?
[e]What is the magnitude and direction of the force that caused the difference in acceleration?
A. Formula: F=ma or F/m=a
10,000N/1,267kg≈7.9m/[tex]s^{2}[/tex]
B. Formula: a=[tex]\frac{V-V_{0} }{t}[/tex] and s=d/t
speed= 394.6/15
s=26.3m/s
a=[tex]\frac{26.3-0}{15}[/tex]
a=1.75m/[tex]s^{2}[/tex]
C. 7.9-1.75=difference of 6.15m/[tex]s^{2}[/tex]
D. The force that most likely caused this difference is friction forces
Answer:
Part a)
[tex]a = 7.89 m/s^2[/tex]
Part b)
[tex]a = 3.51 m/s^2[/tex]
Part c)
[tex]\Deltra a = 4.38 m/s^2[/tex]
Part d)
This difference in acceleration is due to some frictional force on the surface.
Part e)
[tex]F_f = 5552.8 N[/tex]
Explanation:
Part a)
As we know by newton's II law
[tex]F = ma[/tex]
here we know that
[tex]m = 1267 kg[/tex]
[tex]F = 10,000 N[/tex]
Now we have
[tex]a = \frac{F}{m}[/tex]
[tex]a = \frac{10,000}{1267}[/tex]
[tex]a = 7.89 m/s^2[/tex]
Part b)
distance covered by the car
[tex]d = 394.6 m[/tex]
t = 15 s
now by kinematics we have
[tex]d = \frac{1}{2}at^2[/tex]
[tex]394.6 = \frac{1}{2}a(15^2)[/tex]
[tex]a = 3.51 m/s^2[/tex]
Part c)
Difference of acceleration is given as
[tex]\Delta a = a_{expected} - a_{real}[/tex]
[tex]\Delta a = 7.89 - 3.51 [/tex]
[tex]\Deltra a = 4.38 m/s^2[/tex]
Part d)
This difference in acceleration is due to some frictional force on the surface.
Part e)
Now for magnitude of force is given as
[tex]F - F_f = ma[/tex]
[tex]10,000 - F_f = ma[/tex]
[tex]10,000 - F_f = 1267\times 3.51[/tex]
[tex]F_f = 5552.8 N[/tex]
how far will a rubber ball fall on 20 seconds?
Given that:
time (t) = 20 s ,
S = ?
We know that S = ut + 1/2 at² meters
since free fall, a = g = 9.81 m/s² ; u =0 ;
S = 0 + 1/2 × 9.81 × 20²
S= 1962 m
imagine you are in a sports team, there is one player on you team who is the star athlete. you notice that he/she does not include players who are good as they are; he/she puts down their teammates. how would you encourage this player to be more inclusive and supportive of all the player on the team? create a dialogue with this person.
Final answer:
In order to encourage the star athlete to be more inclusive and supportive, start by acknowledging their talent and having a gentle conversation about their behavior. Emphasize the importance of teamwork and suggest activities to foster inclusivity.
Explanation:
To encourage the star athlete on your sports team to be more inclusive and supportive of all the players, you could have a dialogue with them. Start by acknowledging their talent and achievements and express your admiration for their skills. Then, gently bring up the issue of their behavior towards other players and explain how it affects team dynamics.
Next, emphasize the importance of teamwork and how their support can uplift and motivate other players. Share examples of successful teams that have thrived because of a positive and inclusive team culture. Encourage them to recognize and appreciate the strengths of their teammates.
Suggest activities or team-building exercises that can help foster inclusivity and encourage interactions among all team members. Additionally, remind them of the power of their influence as a star athlete and how they can set an example for others by embracing a supportive and inclusive attitude.
CAN SOMEONE PLEASE HELP ME WITH MY PHYSICS QUESTIONS? I NEED CORRECT ANSWERS ONLY!
Free fall is a situation in which the only force acting upon an object is gravity. Why do all objects in free fall have the same acceleration?
A) their masses are always the same
B) acceleration due to gravity is always the same
C) the distance between two objects is always the same
D) the gravitational force between two objects are always the same
According to the experiments done and currently verified, in vacuum (this means there is not air or any fluid), all objects in free fall experience the same acceleration, which is the acceleration of gravity.
Now, in this case we are on Earth, so the gravity value is [tex]9.8\frac{m}{s^{2}}[/tex]
Note the objects experience the acceleration of gravity regardless of their mass.
Nevertheless, on Earth we have air, hence air resistance, so the afirmation "Free fall is a situation in which the only force acting upon an object is gravity" is not completely true on Earth, unless the following condition is fulfiled:
If the air resistance is too small that we can approximate it to zero in the calculations, then in free fall the objects will accelerate downwards at [tex]9.8\frac{m}{s^{2}}[/tex] and hit the ground at approximately the same time.
A horizontal spring oscillator consists of a mass attached to a spring of constant 712 N/m. There is no friction.
What mass (kg) should be attached for the oscillator to oscillate with a period of 0.47 seconds?
Answer:
3.99 kg
Explanation:
The period of a harmonic oscillator is given by:
[tex]T=2 \pi \sqrt{\frac{m}{k}}[/tex]
where
m is the mass attached to the spring
k is the spring constant
In this problem, we know:
k = 712 N/m
T = 0.47 s
Therefore, we can re-arrange the equation to find the mass that should be attached to the oscillator:
[tex]m=\frac{k T^2}{(2 \pi)^2}=\frac{(712 N/m)(0.47 s)^2}{(2 \pi)^2}=3.99 kg[/tex]
A mass of 3.97 kg should be attached.
The student asks what mass should be attached to a spring for a horizontal spring oscillator to oscillate with a period of 0.47 seconds, given the spring constant is 712 N/m and there is no friction. To find the mass, we use the formula for the period T of a simple harmonic oscillator: T = 2π√(m/k), where m is the mass in kilograms and k is the spring constant in newtons per meter. Rearranging the formula to solve for m gives us m = (T/(2π))2 × k.
Plugging in the given values:
Calculate (0.47 / (2π))2 = 0.005577... (rounded to nine decimal places).
Multiply this by the spring constant 712 N/m gives us 0.005577 × 712 = 3.970544 kg.
Therefore, the mass that should be attached to the spring is approximately 3.97 kg.
A primary succession does not include any invasive species
True or false
A primary succession does not include any invasive species. This is true statement.
What is primary succession?When a new piece of land is produced or is first exposed, primary succession occurs. This may occur, for instance, when lava solidifies and forms new rocks or when a glacier recedes and reveals bare rocks. In the initial succession, organisms have to start over. First, lichens may cling to rocks, followed by a few small plants capable of surviving without much soil. The term "pioneer species" refers to these.
More and larger plants start to colonize the region as a result of the decomposition of those plants, which gradually helps to create soil. Once sufficient soil has accumulated and sufficient nutrients are accessible, a climax community, such as a forest, is created. In the event that the site is disturbed after this, secondary succession takes place.
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Students can take the aspire test in ninth and grade
A. First
B. Tenth
C. Eleventh
D. Twelfth
Answer:
The correct answer is option B, tenth
Explanation:
ASPIRE test is basically given by students of ninth and tenth grade as pre-test to the ACT test. ACT ASPIRE test can be given from third grade till tenth grade. The scoring obtained in this test helps the student, teachers and parents to monitor the preparation of their kids towards completing a successful ACT test.
Apart from ninth and tenth grade , students belonging to lower grades (i.e from 3rd grade to 8th grade) can opt for online test. However, higher grades can opt for both online and paper based test.
Students can take the Aspire test in the ninth and grade Tenth. The correct option is B.
What is the Aspire test?The Aspire test is an assessment designed to measure students' readiness for college and careers. It evaluates their skills in English, math, reading, and science. The test is administered by the ACT organization and is typically taken by students in grades 3-10.
While students in ninth grade may be eligible to take the Aspire test, it is not the earliest grade at which it can be taken, and thus option A. First is not correct. The Aspire test is not typically administered to students in the first grade.
Option C. Eleventh and option D. Twelfth are not correct because by these grades, students may have already taken the ACT or SAT, which are the college entrance exams typically taken during the junior and senior years of high school.
Therefore, the correct option is B. Tenth, as this is the grade level at which most students take the Aspire test.
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To read and understand electrical blueprints, you need to know
A. the fundamentals of electrical engineering.
B. how buildings are constructed.
C. how to sketch a plan view.
D. the meaning of electric symbols.
To read and understand electrical blueprints, you need to be familiar with the various electric symbols used in the drawings.
Hence, the correct option is D.
These symbols represent different electrical components and devices, such as switches, outlets, lights, transformers, and more. Understanding these symbols is crucial for interpreting the layout and design of electrical systems in buildings and structures.
While having a background in electrical engineering (A) or knowledge of building construction (B) can certainly be helpful in interpreting electrical blueprints, the most critical aspect is understanding the meaning and representation of electric symbols (D) as they directly convey information about the electrical components and connections in a given system. Knowing how to sketch a plan view (C) is useful but is not specifically essential for reading electrical blueprints.
Therefore, To read and understand electrical blueprints, you need to be familiar with the various electric symbols used in the drawings.
Hence, the correct option is D.
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Which waves can travel through a vacuum? A) light waves Eliminate B) ocean waves C) sound waves D) mechanical waves
A.) Light waves can travel through a vacuum.
The answer is A, light waves eliminate
A 3.00 kg box is lifted by an upward force 1.50 m above the surface pf Earth to the top of a table. What is the potential energy stored in the box at this new position?
The force that keeps an object moving in a circle is called
A. Centripetal force
B. Fluid friction
C. Inertia
D. Momentum
Answer:
Centripetal force
Explanation:
The object that keeps an object in a circle is called uniform circular motion. In this type of motion, the distance covered by an object is equal to the circumference of the circle. The mathematical form of centripetal force is given by,
From second law of motion,
F = m × a
a is the centripetal acceleration
[tex]F=\dfrac{mv^2}{r}[/tex]
So, the correct option is (a) '' centripetal force''.
What is the numerical quantity of the ratio rest energy/rest mass?
Answer: 9 × 10¹⁶ m²/s² (square of speed of light in vacuum)
Explanation:
Einsteins' energy mass relation:
E = mc²
Where, E is energy, m is mass and c is the speed of light.
The ratio of rest energy to rest mass:
[tex]\frac{E_o}{m_o} = c^2[/tex]
speed of light in vacuum is 3 × 10⁸ m/s
Hence, the numerical quantity of the ratio of rest energy/ rest mass = (3 × 10⁸ m/s)² = 9 × 10¹⁶ m²/s².