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1
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Which formula can be used to find the centripetal acceleration of an orbiting object?

A
A sub c is equal to the fraction with numerator v squared and denominator cap t
B
A sub c is equal to the fraction with numerator square root of v and denominator cap t
C
A sub c is equal to the fraction with numerator v squared and denominator r
D
A sub c is equal to the fraction with numerator square root of v and denominator r
2
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Which is the best example of decreasing entropy?

A
A pile of dirt on a floor is cleaned up with a broom.
B
A tree in a forest grows naturally over 10 years.
C
A box of nails is left in the rain and the nails rust over time.
D
A puddle of water is exposed to the sun and evaporates.
3

Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

A
Their forces are occurring at different times.
B
There are no forces acting on the objects.
C
The forces are equal and opposite each other.
D
One object is exerting more force than the other.
4

Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

A
Their forces are occurring at different times.
B
There are no forces acting on the objects.
C
The forces are equal and opposite each other.
D
One object is exerting more force than the other.
5

Which is an action that can cause an object to move or change its state of motion?

A
energy
B
equilibrium
C
force
D
inertia
6

Which describes the movement of a fluid during convection?

A
Warm and cool fluids rise.
B
Warm fluid rises and cool fluid sinks.
C
Warm and cool fluids sink.
D
Warm fluid sinks and cool fluid rises.
7

A 150 g egg is dropped from 3 point 0 meters. The egg is moving at 4.4 meters per second right before it hits the ground. The egg comes to a stop in 0 point 0 7 2 seconds. What is the magnitude of force that the ground exerted on the egg?

A
9 point 2 cap n
B
13 cap n
C
0 point 6 6 cap n
D
180 cap n
8

Luke pulls a sled using a force of 65 cap n for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25 degrees with the ground. About how much work does Luke do on the sled?

A
690 J
B
1 comma 500 J
C
250 J
D
1 comma 600 J
9

Which energy transformation occurs after a skydiver reaches terminal velocity?

A
Gravitational potential energy transforms into thermal energy.
B
Gravitational potential energy transforms into kinetic energy.
C
Kinetic energy transforms into gravitational potential energy.
D
Kinetic energy transforms into thermal energy.
10

An object with a mass of 20 kilograms has a net force of 80 cap n acting on it. What is the acceleration of the object?

A
4 the fraction with numerator m and denominator s squared
B
60 the fraction with numerator m and denominator s squared
C
0 point 2 5 the fraction with numerator m and denominator s squared
D
100 the fraction with numerator m and denominator s squared
11

A boat travels in a straight path that is 25 degrees west of north. Which describes the values of the west and north components of the boat’s displacement?

A
The west component is a positive number, and the north component is a negative number.
B
Both components are positive numbers.
C
Both components are negative numbers.
D
The west component is a negative number, and the north component is a positive number.
12

In the equation for centripetal force, which expression represents the centripetal acceleration of the object?

A
m over r
B
the fraction with numerator m v squared and denominator r
C
the fraction with numerator v squared and denominator r
D
m v squared
13

Sixty-three joules of heat are added to a closed system. The initial internal energy of the system is 58 J, and the final internal energy is 93 J. How much work is being done by the system?

A
88 J
B
30 J
C
28 J
D
151 J
14

If a 4 point 5 kilograms object is dropped from a height of 6 point 0 m , what will be its velocity when it is halfway toward the ground? (Use g is equal to 9 point 8 0 the fraction with numerator m and denominator s squared , and ignore air resistance.)

A
11 meters per second
B
16 meters per second
C
29 meters per second
D
7.7 meters per second
15

A cyclist rides at a constant speed of 4 point 5 m/s around a curve. If the centripetal acceleration is 29 m/s squared , what is the radius of the curve?

A
0 point 1 6 m
B
0 point 7 0 m
C
34 m
D
6 point 4 m
16

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

A
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
B
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
C
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
D
For large nuclei, the mass of the original nucleus is less than the mass of the products.
17

In the heat equation, what does Q represent?

A
mass of the substance
B
heat required to raise the temperature
C
change in temperature
D
specific heat of the substance
18

Which statements describe the use of gamma rays to treat cancer? Choose two correct answers.

A
Gamma rays are absorbed by only the cancer cells.
B
Gamma rays are applied to a large area of the body.
C
Gamma rays have low energy and a source must be placed in the body.
D
Gamma rays kill cancer cells in a tumor.
E
High-energy gamma rays are directed at a tumor from outside of the body.
19

Which is the best example of decreasing entropy?

A
A box of nails is left in the rain and the nails rust over time.
B
A puddle of water is exposed to the sun and evaporates.
C
A pile of dirt on a floor is cleaned up with a broom.
D
A tree in a forest grows naturally over 10 years.
20

Suppose an object’s initial velocity is 10 meters per second and its final velocity is 4 meters per second Mass is constant. What can best be concluded about the object based on the work-energy theorem?

A
Work is negative, the environment did work on the object, and the energy of the system decreases.
B
Work is positive, the environment did work on the object, and the energy of the system increases.
C
Work is positive, the object did work on the environment, and the energy of the system increases.
D
Work is negative, the object did work on the environment, and the energy of the system decreases.

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