Answer:
Air resistance: 68.6 N
Explanation:
For the skydiver falling down, there are two forces acting on him:
- The force of gravity, of magnitude
[tex]W=mg[/tex]
where
m = 7.0 kg is the mass of the skydiver
[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity
This force acts in the downward direction
- The air resistance, R, in the upward direction
So the net force on the skydiver is:
[tex]\sum F=mg-R[/tex]
According to Newton's second law of motion, the net force is also equal to mass times acceleration:
[tex]\sum F=ma[/tex]
However, in this problem the skydiver is falling at constant velocity, so his acceleration is zero:
[tex]a=0[/tex]
Therefore, the net force is zero:
[tex]\sum F=0[/tex]
And so we can find the magnitude of the air resistance, which is equal to the weigth of the skydiver:
[tex]mg-R=0\\R=mg=(7.0)(9.8)=68.6 N[/tex]
This question involves the physics concept of terminal velocity. It's the constant speed a skydiver descends when the force of gravity equals the upward force of air resistance.
Explanation:The subject of this question involves a concept in physics known as terminal velocity. When a skydiver jumps out of a plane, gravity pulls them downwards, while air resistance pushes upwards. As the skydiver falls faster, air resistance increases until it is equal to the pull of gravity. At this point, the skydiver no longer accelerates and falls at a constant velocity. This is the terminal velocity. In this particular case, the fact that the 7.0kg skydiver is descending at a constant velocity tells us that he has reached his terminal velocity.
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1. For a reaction to occur, energy must be
to break chemical bonds.
O A released
OB converted
OC absorbed
For a reaction to occur, energy must be absorbed to break chemical bonds
Explanation:
Reactions can be classified as chemical reaction, nuclear reaction, thermal reaction. So in these three reaction types, the nature of energy will only be varying.
But in order to execute a reaction, there should be breaking of existing bonds and then formation of new bonds. So for breaking of the bonds of reactants, energy should be absorbed from the surrounding.
Then the extra energy will be released after forming the products. Thus, the process of absorption of energy will lead to endothermic process and the process of releasing of energy will lead to exothermic reaction. So for a reaction to occur, energy must be absorbed to break the chemical bonds.
Which statement accurately describes renewable energy sources?
They take millions of years to form and should be used responsibly.
They include fossil fuels and hydroelectric power.
They are quickly replenished.
They provide the majority of the energy for the United States.
Answer:
They are quickly replenished
Explanation:
Renewable resources will never run out because they are quickly replaced by nature.
ask me if I you need more help
Answer:
c
Explanation:
Acceleration
a=124 -0)3
a (Vf-vilt
a velocity
Vf- fina velocity
t = time vizan
initial velocity
Answer:
[tex]41.3 m/s^2[/tex]
Explanation:
The acceleration of an object is the rate of change of the velocity of the object.
It is a vector quantity, so it has a magnitude and a direction.
The acceleration is given by:
[tex]a=\frac{v_f-v_i}{t}[/tex]
where
[tex]v_f[/tex] is the final velocity
[tex]v_i[/tex] is the initial velocity
t is the time taken for the velocity to change
If the acceleration is positive, the direction is the same as the initial velocity; if the acceleration is negative, the direction is opposite to the initial velocity.
In this problem:
[tex]v_i=0[/tex] is the initial velocity
[tex]v_f=124 m/s[/tex] is the final velocity
t = 3 s is the time
So, the acceleration is
[tex]a=\frac{124-0}{3}=41.3 m/s^2[/tex]
If the radius of the atom is the distance from point A to D, where is the MOST likely location of the LEAST concentration of mass?
A)
A
B)
B
C)
C
D)
D
The MOST likely location of the LEAST concentration of mass in an atom is at point D, which is at the radius of the atom.
1. The nucleus of an atom contains the majority of the mass and is located at the center of the atom.
2. As you move away from the nucleus towards the electron cloud, the concentration of mass decreases significantly.
3. At the radius of the atom (point D), the mass is distributed over a larger area, leading to the least concentration of mass at this point.
4. Therefore, point D, being at the outer edge of the atom, is the most likely location of the least concentration of mass in an atom.
This concept is crucial in understanding the distribution of mass within an atom and how it varies based on distance from the nucleus.
An electric appliance draws 1.5 amperes of current when it is connect
24-volt source. What is the resistance of this appliance? (5F)
F
0.063 ohm
G
11 ohm
H
16 ohm
54 ohm
Answer:16ohm
Explanation:
Potential difference(v)=24volts
Current(I)=1.5amperes
Resistance(r)=?
r=v/I
r=24/1.5
r=16ohms
Final answer:
To calculate the resistance of an electrical appliance using Ohm's Law, divide the voltage by the current. With a 24-volt source and a draw of 1.5 amperes, the appliance's resistance is 16 ohms.
Explanation:
To find the resistance of an electrical appliance, we can use Ohm's Law, which states that resistance equals voltage divided by current (R = V/I). Given that the appliance draws 1.5 amperes of current from a 24-volt source, we can calculate the resistance as follows:
R = V / I
R = 24 V / 1.5 A
R = 16 ohms
Therefore, the resistance of the appliance is 16 ohms.
A needle 5cm long can just rest on the surface of the water without wetting. What us it's weight? Surface tension is 0.007N/m
Answer:
c
Explanation:
what are the similarities between air pressure, temperature, humidity, and fronts?
Answer:
Explanation:
An air mass is a large body of air that exhibits uniform temperature and moisture characteristics and helps to determine the weather within an area. Warm air masses tend to form over oceans in warm-temperature regions of the tropics and sub-tropics, while cold air masses tend to form over land in cold-weather regions nearer the poles. The cold air masses that form at the poles move toward the equator, while the warm air masses that form at the equator move toward the poles. These air masses can undergo gradual, but significant, changes as they pass over warmer or colder land surfaces encountering different types of air. These boundary lines are called fronts.
Cold fronts occur when a cold air mass moves into warmer air. Since cold air is heavier than warm air, the incoming colder air forms a wedge that displaces the warm, and often moist, air at the surface. As the warm moist air rises, towering clouds often form releasing energy in the form of brief, intense rain storms with high winds and lightning. On the other hand, warm fronts will ride up and over cold air near the surface. These fronts can also cause clouds and rain, but they tend to be less violent and longer lasting.
Air pressure is determined by how much the air weighs in a given space. Pressure varies with altitude, with denser air residing in lower altitudes and lighter air in higher altitudes. This is caused by the Earth’s gravity—its strength decreases the farther away from the center of the planet, therefore it holds fewer molecules together in the same amount of space. Air pressure is also a function of temperature and density; differences in pressure can be an important weather maker. As air descends, it warms, inhibiting cloud formation which is often associated with good weather. Air rises in areas where the pressure at the surface is low. As it rises, the air cools and the humidity condenses to form clouds and precipitation. The centers of all storms are areas of low pressure; therefore, low pressure is often associated with bad weather.
7. What two controls on a car cause a change in speed? What control causes a change in
velocity?
-- A change in speed can be either speeding up or slowing down. These effects can be caused by the gas pedal or the brake pedal.
-- Velocity is made of the car's speed and direction. These can be changed by the gas pedal, the brake pedal, or the steering wheel.
Final answer:
The two controls causing a change in car speed are the accelerator and brakes. For velocity, any change in speed or direction (affected by the accelerator and steering wheel) can alter it. An odometer measures distance traveled, while a speedometer measures instantaneous speed.
Explanation:
The two controls on a car that cause a change in speed are the accelerator (gas pedal) and the brakes. Pressing the accelerator increases the car's speed, while applying the brakes decreases it. The control that causes a change in velocity is both the accelerator and the steering wheel. This is because velocity includes both speed and direction. Thus, pressing the accelerator affects speed, which is a part of velocity, and turning the steering wheel alters the direction of the car's velocity.
Velocity is defined by both speed, which is a scalar quantity, and direction, a vector quantity. Changing either of these two or both simultaneously, results in a change in velocity. Acceleration, therefore, refers to the rate at which velocity changes over time and can occur due to a change in speed, direction, or both. For example, when a car moves from left to right at a constant velocity and the accelerator is pressed, both the velocity and acceleration vectors point rightwards. However, if the brakes are applied while the car is still moving to the right, the velocity remains directed to the right but the acceleration vector points to the left, indicating deceleration.
The car's odometer measures the total distance traveled, which is a scalar quantity, while the speedometer measures the instantaneous speed of the car, also a scalar. To illustrate the difference between average speed and the magnitude of average velocity consider a car trip where the car moves in a circle and returns to its starting point. The average speed is the total distance traveled divided by the elapsed time, whereas the magnitude of average velocity would be zero since displacement is zero after completing the loop. The two quantities are the same if the car travels in a straight line without changing direction.
Along boundaries plates are brittle and the crust fractures (breaks and cracks) forming ___
Answer:
Along boundaries plates are brittle and the crust fractures (breaks and cracks) forming Faults
Explanation:
Brittle material are substances that looks hard but can be easily broken by strain. Brittle deformation leads to crack and fracture of the material involve. Brittle crust lacks elastic ability , elasticity in this rocks are almost absent.
Fractures and cracks in rocks form fault. Fault is a discontinuity in rocks with an appreciable displacement. Fault is a displacement in rocks relative to one part. Generally, Fault occur when brittle rock fracture or crack, the fractured rocks move relative to one another.
Differential stress can cause rocks to fracture. If that part of the crust lacks ductility the stress on the rock will cause a brittle deformation. The brittle deformation causes fracture(breaks and cracks) leading to structure like Faults and Joints.
A string of fifty 15 ohm Christmas tree lights are connected in series. One burns out, they all burn out.Calculate the total resistance. (Draw a one way switch to control all of them at once)
The effective resistance of many individual resistors in series is the sum of the individual resistances.
50 items in series, each with a resistance of 15 ohms, are equivalent to a single resistance of (15 x 50) = 750 ohms.
By the way . . . If one of the little bulbs in series burns out, all the others do NOT burn out. They simply get turned off and go dark, because the current can't flow through the one that did.
The total resistance of the string of fifty 15 ohm Christmas tree lights that are connected in series is 750 ohms.
Total resistance of the series resistors
The total resistance of the series resistors is determined by adding all the componenets of the resistors together.
Rt = R1 + R2 + R3 + ----
where;
Rt is the total resistance of the series circuitRt = 50 x (15 ohms)
Rt = 750 ohms
Thus, the total resistance of the string of fifty 15 ohm Christmas tree lights that are connected in series is 750 ohms.
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6. A Cadillac Escalade has a mass of 2 569.6 kg, if it accelerates at 4.65m/S
force on the car?
Answer:
F= 2569.6 X 4.65 = 11,948.64
*Multiply the mass and the acceleration to find the force
Explanation:
Answer:11948.64kgm/s^2
Explanation:
Force=mass x acceleration
Force=2569.6 x 4.65
Force=11948.64kgm/s^2
List two ways you changed the speed of the ball without changing its direction..
An airplane travels 622.4 km from Kansas City to St. Louis. The flight takes 4.7 hours. Calculate the Velocity of the plane
Answer:
132.43km/h
Explanation:
Velocity = displacement/time
Given
Displacement = 622.4km
Time = 4.7 hours
Therefore,
Velocity = 622.4km/4.7hrs
= 132.43km/h
which direction does air pressure exert force at sea level
Answer:
It is exerted in all directions at sea level, and this is because air molecules move in all directions.
At sea level, air pressure exerts force in all directions.
Direction of air pressure at sea levelAt sea level, air pressure exerts force in all directions. This force, known as atmospheric pressure, is the result of the weight of the air molecules above a given point.
Since air is a fluid, the air pressure at any location is distributed evenly in all directions, including upward, downward, and sideways.
This balanced distribution of air pressure is what helps maintain the stability of the Earth's atmosphere and is an essential factor in various weather phenomena and atmospheric dynamics.
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Mercury's surface has many craters because _____.
it has no atmosphere to protect it from meteoroids or comets
it has several active volcanoes which erupt and melt holes in the rock
it once collided with another planet, which caused damage to its crust
it has a thick atmosphere which traps meteoroids and comets near the surface
Mercury's surface has many craters because it has no atmosphere to protect it from meteoroids or comets.
Mercury's surface is riddled with craters, owing to the lack of a strong atmosphere to shield it from meteoroids and comets.
Meteoroids are small rocky or metallic objects in space that range in size from minuscule particles to bigger things with diameters of several metres.
They are generally relics of the solar system's early creation or debris expelled by asteroids or comets.
Unlike Earth, which has an atmosphere that burns up or deflects most smaller things that enter it, Mercury's thin atmosphere offers little to no protection.
Thus, meteoroids and comets can collide with its surface, causing countless craters to form over time.
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A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron? A 0.00578 J/g°C B 0.45 J/g°C C 2.20 J/g°C D 4.18 J/g°C
Answer:
b.
[tex]0.45J/g\textdegree C[/tex]
Explanation:
Specific heat capacity is the amount of heat required to raise one gram of substance by one degree celcius.
It's calculated by the formula:[tex]s=\frac{q}{m\bigtriangleup T}[/tex], where q=heat and m= mass
[tex]\bigtriangleup T=20-0=20\textdegree C\\q=1004J\\m=111.6g[/tex]
Therefore:
[tex]s=\frac{1004J}{111.6g\times20\textdegree C}\\=0.45J/g\textdegree C[/tex]
Hence the iron's specific heat capacity is [tex]0.45J/g\textdegree C[/tex]
All the mass we ever encounter is positive - nothing weighs less than zero. What makes us think charge is different that there are both positive AND negative charges?
Answer:
Mass is considered as positive as it is the amount of matter and as nothing weighs less than zero. But the concept of charge in electricity can be both positive and negative because of the behaviour Observed in electrical phenomena , Conservation of charge , Interaction of charged objects and Atomic and subatomic structure
Explanation:
Understanding the nature of mass and its positivity
Mass is the amount of matter in an object. As the amount of matter cannot be less than zero. It is always greater than or equal to zero.
Exploring the concept of electric charge
Incase of electric charge it acts differently as per the system it belongs to, The following are some observation which substantiate the presence of negativity and positivity of electric charge.
a) Observations of electrical phenomena: People have observed electrical effects, such as static electricity, where objects can be attracted or repelled without physical contact. This led to the idea that there are two types of charges involved.
b) Conservation of charge: Scientists observed that charge is conserved in interactions. For example, during various experiments involving the charging and discharging of objects, the total amount of charge in a closed system remained constant. This observation supports the idea of positive and negative charges.
c) Behavior of charged objects: Through experiments, scientists found that like charges repel each other, while opposite charges attract. This behavior is consistent with the existence of positive and negative charges.
d) Atomic and subatomic structure: Detailed studies of atoms revealed that they consist of positively charged protons, negatively charged electrons, and neutral neutrons. The balance between protons and electrons determines the overall charge of an object.
Hence the mass never considered as negative and we think differently for electric charge
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The diagram shows the protons and neutrons in an atom.
p = protons n = neutrons
Which fundamental force is shown?
O static
o electromagnetic
O strong
O light
p
7
na LA
P
n
Answer:
O strong
Explanation:
From the diagram, we are dealing with strong forces.
Strong forces are one of the four fundamental forces found in nature. The other forces are gravitational forces, electromagnetism and weak interactions.
Strong forces holds protons and neutrons together in an atom. They are domiciled in the nucleus and are sources of nuclear energy. They are also called strong nuclear forces.Answer:
Strong
Explanation:
The man who discovered that for an interference pattern to occur, the only explanation is that light is a wave was:
a) Newton
b) Young
c) Taylor
d) Planck
Answer:
Thomas Young
:0
:)
Answer:
it was Young
Explanation:
The heat transfer depicted in the image is MOST likely
Answer:
Convection transferExplanation:
There are three kinds of heat transfer: conduction, convection, and radiation.
Conduction is the heat transfer by direct contact of a hot object with a cold object. It is transmitted by the vibration of the particles and not by translation motion. That is not what it is shown: the clouds are not in direct contact with the ground.
Heat transfer by convection is result of the motion of the particles in fluis, like water or air: particles move from hotter regions where they have high kinetic energy to colder regions where the particles have lower kinetic energy. Since the hotter fluids have lower density than the colder fluids, there will be a continous movement of parciles and heat. That is what is shown in the figure with the arrows.
Radiation heat transfer mechanism always occur but is only important when the temperature of the hot object is really high, like in a fire, or in a resistance to red hot, or in the Sun. The heat is radiated by infrarred radiation. That is not what is shown in the figure.
A missile is moving 1350 m/s at 25.0° angle. It needs to hit in a 55.0° direction in 10.20 s. What is the direction of its final velocity?
Answer:
final velocity = 3504 m/s
Explanation:
Given data:
velocity of missile = Vi = 1350m/s
angle at which missile is moving = 25degree
distance between missile and targets = 23500m
angle between target and missile=55degree
time=10.2s
To find:
Final velocity: ?
Formula:
x = Vx*t + ½*ax*t²
Let x be the horizontal component of distance
x = ertical component of distance
t-time
ax = horizontal component of acceleration
ay = Vertical component of acceleration
Vx = horizontal component of velocity
Vy = Vertical component of velocity
Solution:
x = Vx*t + ½*ax*t²
23500m * cos55.0º = 1350m/s * cos25.0º * 10.20s + ½ * ax * (10.20s)²
ax = 19.2 m/s²
V'x = Vx + ax*t = 1350m/s * cos25.0º + 19.2m/s² * 10.20s = 1419 m/s
similarly vertically:
y = Vy*t + ½*ay*t²
23500m * sin55.0º = 1350m/s * sin25.0º * 10.20s + ½ * ay * (10.20s)²
ay = 258 m/s²
V'y = Vy + ay*t
= 1350m/s * sin25.0º + 258m/s² * 10.20s = 3204 m/s
V = √(V'x² + V'y²)
= 3504 m/s
You should never swim alone true or false
Answer:True
Explanation:
if you were to swim alone and something bad happen and there was none on the beach you'd be stuck out so NEVER swim alone :)
Dominic Roth is in a roller coaster car, which rapidly picks up speed as it rolls down a slope.
As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the
slope, his speed is 22 m/s. What is its average acceleration?
Answer: 6m/s²
Explanation:
Acceleration = change in velocity / time
Initial velocity = 4m/s
Final velocity = 22m/s
Time = 3s
Acceleration = (22 - 4) / 3
a = 18 / 3 = 6m/s²
what happens when a plastic lid sprinkled with iron filings is placed over a magnet?
When a plastic lid is sprinkled with iron filings is placed over a magnet then a pattern is formed. The iron fillings arrange themselves in a way how magnetic field is present. The force of the magnet is the strongest at the two ends because more iron particles are concentrated in these areas. The magnetic lines of flux flow from one end to the other.
One way to describe a wave crest is the amount of ___________ applied over an area.
A. force
B. mass
Answer: The answer is force
Explanation:
A man whose mass is 90 kg is 6.38x106m away from the center of the earth. If the Earth’s mass is6x1024kgand the constant Gis 6.67x10-11what is the force of gravity on the man
Answer: force of gravity is 885N
Explanation:
Answer:1N
Explanation:
Mass1(m1)=90kg
Mass2(m2)=6x10^24kg
Gravitational constant(G)=6.67x10^(-11)
Distance apart(d)=6.38x10^6m
Force of gravity(f)=?
F=(Gxm1xm2)/d^2
F=(6.67x10^(-11)x90x6x10^24)/(6.38x10^6)
F=(3.6018x10^16)/(6.38x10^6)
F=1N
Force of gravity=1N
Which answer best describes the scientific method?
O
A. An experiment that has no dependent variables
B. Five processes that scientists use to answer questions
C. A variable that depends on another variable
O
D. The exact order of steps used in every experiment
option no. c
Explanation:
A variable that depends on another variable
Answer:
B. Five processes that scientists use to answer questions
Explanation:
Explain how a current is created and how a circuit works.
Answer:
See the explanation below
Explanation:
Ohm law is defined as the voltage is equal to the current product by the resistance.
V = I * R
where:
V = voltage [volt]
I = current [amp]
R = resistance [ohm]
Therefore for a current to exist there must be a voltage and elements that exert resistance to the passage of electrons from one point to another.
There must be a closed loop between the connection points of the source, so that the current can flow freely. Any opening of the circuit will interrupt the current flow.
With enough time, would an ice pop melt on a cool autumn day? Explain.
Yes, it is possible that with enough time period, an ice pop will melt on a cool autumn day. As it is not cold enough to keep it in the freezing condition.
What are the conditions for ice formation?An ice cube can stay in the freezing condition when it is most often found at the temperature range above the frontal inversion which is warmer than 0°C and the temperature which is below and colder than 0°C. Icing above the warm frontal surface, in the regions where cloud temperatures are colder than 0°C, is usually confined to a layer which is less than 3,000 feet thickness.
A one inch ice cube at the 75°F room temperature (24°C) will take 45 to 60 minutes to melt at that particular temperature. A standard one ounce cube will take 90 to 120 minutes to melt at the same temperature range.
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is the positively charged particle has magnetic field around it self??? thanksss fo your help
Answer:
Electric field lines are generated on positive charges and terminate on negative ones. The field lines of an isolated charge are directly radially outward. The electric field is tangent to these lines. Magnetic field lines, in the case of a magnet, are generated at the north pole and terminate on a south pole.