AnswersLiberty - Physics AUnit Test

Unit Test — Cumulative exam Answers

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1
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The diagram shows two vectors that point west and north.

Question illustration
A
13 miles
B
17 miles
C
60 miles
D
169 miles
2
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A car manufacturer wants to change its car’s design to increase the car’s acceleration. Which changes should the engineers consider making to the design?increase the force that the engine providesdecrease the force that the engine providesincrease the mass of the cardecrease the mass of the carincrease the top velocity the car can traveldecrease the top velocity the car can travel

A
increase the force that the engine provides
B
decrease the force that the engine provides
C
increase the mass of the car
D
decrease the mass of the car
E
increase the top velocity the car can travel
F
decrease the top velocity the car can travel
3

A student wants to determine the impulse delivered to the lab cart when it runs into the wall. The student measures the mass of the cart and the velocity of the cart before it hits the wall.

A
the velocity of the cart after it hits the wall
B
the force exerted on the cart by the wall
C
the time the cart is in contact with the wall
D
the acceleration of the cart before it hits the wall
4

A spring has a spring constant of 48 N/m. The end of the spring hangs 8 m above the ground.

A
96 N
B
288 N
C
384 N
D
480 N
5

The diagram shows what happens to a system undergoing an adiabatic process.

Question illustration
A
X: Work is done by the system and temperature decreases.Y: Work is done to the system and temperature increases.
B
X: Work is done to the system and temperature increases.Y: Work is done by the system and temperature decreases.
C
X: Work is done by the system and temperature increases.Y: Work is done to the system and temperature decreases.
D
X: Work is done to the system and temperature decreases.Y: Work is done by the system and temperature increases.
6

What is the acceleration along the ground of a 10 kg wagon when it is pulled with a force of 44 N at an angle of 35° above the horizontal?

A
0.23 m/s2
B
0.28 m/s2
C
2.52 m/s2
D
3.60 m/s2
7

A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown.

Question illustration
A
It begins to move toward the right.
B
It stays in static equilibrium.
C
It stays in dynamic equilibrium.
D
It begins to move toward the left.
8

Describe the shape of liquid water as it is poured into a glass.

A
The shape stays the same as it was before it was poured.
B
The shape changes to fit the glass and then stays the same.
C
The shape stays the same, and the shape of the glass changes.
D
The shape changes and continues to change long after pouring stops.
9

A ball moves in a circle at the end of a string, as shown.

Question illustration
A
W
B
X
C
Y
D
Z
10

Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table.

Question illustration
A
X, Y, W, Z
B
X, W, Y, Z
C
Z, W, Y, X
D
Z, Y, W, X
11

A wind turbine takes in energy from wind with the goal of converting it into electrical energy. Much of the wind energy is also converted into the kinetic energy of the spinning turbine and heat lost to the air around it.

Question illustration
A
25%
B
50%
C
75%
D
100%
12

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A
0.57 m
B
0.64 m
C
0.80 m
D
1.25 m
13

A block slides down a rough ramp with a 30-degree incline as shown.Which diagram represents the forces acting on the block?

Question illustration
A
Option
B
Option
C
Option
D
Option
14

In a lab experiment, a student is trying to apply the conservation of momentum. Two identical balls, each with a mass of 1.0 kg, roll toward each other and collide. The velocity is measured before and after each collision. The collected data is shown below.Which trial shows the conservation of momentum in a closed system?

Question illustration
A
Trial 1
B
Trial 2
C
Trial 3
D
Trial 4
15

Frank wrote several statements to summarize the relationship between the first and second laws of thermodynamics.1 - Thermal energy is conserved. 2 - Some thermal energy is lost and some is used to do work. 3 - Thermal energy flows from areas of higher to lower temperatures. 4 - Thermal energy can be transferred and transformed.

A
1
B
2
C
3
D
4
16

Ronnie kicks a playground ball with an initial velocity of 16 m/s at an angle of 40° relative to the ground. What is the approximate horizontal component of the initial velocity?

A
0.64 m/s
B
0.77 m/s
C
10.3 m/s
D
12.3 m/s
17

Which is an example of conduction?

A
Soup is warmed in a microwave oven.
B
A hand is burned when touching a pot handle.
C
Air above an ocean warms up and rises.
D
A stone gets hot from sitting outside on a sunny day.
18

It requires 350 joules to raise a certain amount of a substance from 10.0°C to 30.0°C. The specific heat of the substance is 1.2 J/g°C.

A
12 g
B
15 g
C
18 g
D
30 g
19

A train travels 600 km in 4 hours. What is the speed of the train?

A
0.007 km/h
B
604 km/h
C
150 km/h
D
2,400 km/h
20

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball?

A
The change in momentum increases because the impact time increases.
B
The change in momentum decreases because the force decreases.
C
The change in momentum stays the same because the ball still comes to a stop.
D
The change in momentum depends on the initial speed of the ball and the time to stop.

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