16.

A certain fully loaded car has a mass of

2830

kg. If the car is driving at a speed of

24.4

m/s, how much kinetic energy does the car have?

	8.42 10 5 J
	1.68 10 6 J
	2.19 10 5 J
	34 , 500 J

17.

At a depth of

3

m, the pressure under water is equal to approximately

29

,

430

Pa. At this depth, what force is the water exerting over an area of

0.00125

m

2

?

	9.45 N
	21.1 N
	51.6 N
	36.8 N

18.

A car is driving around a circular track. The tires on the car are only designed to withstand a centripetal acceleration of

14.5

m

s

2

. If the track has a radius of

29.0

m, what is the maximum speed the car can drive on the track?

	11.0 m/s
	19.1 m/s
	14.5 m/s
	20.5 m/s

acceleration?

	1.8 m/s 2
	1.4 m/s 2
	0.39 m/s 2
	2.1 m/s

20.

Alice is watching a wind turbine spin. She watches the turbine for

2.0

minutes, and counts

35

total revolutions in that time span. Based on this observation, what is the period of rotation for the wind turbine?

	17.5 s
	120 s
	3.4 s
	0.29 s

21.

Two students are standing next to one another. One student has a mass of

79.0

kg, and the other has a mass of

93.5

kg. If they are standing so that their centers of mass are a distance of

1.12

m apart, what is the force of the gravitational attraction between them?

	8.77 10 6 N
	1.29 10 6 N
	4.40 10 7 N
	3.93 10 7 N

22.

Jodie is riding her bicycle around town. At the top of a certain hill, she has

380

J of kinetic energy, and

9450

J of gravitational potential energy. Ignoring friction, how much total energy will Jodie have when she is at the bottom of the hill.

	9070 J
	9830 J
	380 J
	9450 J

23.

A certain planet orbiting a nearby star is observed to have a nearly circular orbit of radius

9.79

10

7

km, and an orbital period of

104.4

days. What is the mass of the start that this planet orbits?

	4.34 10 30 kg
	1.96 10 28 kg
	4.09 10 30 kg
	6.69 10 29 kg

24.

In track and field, the hammer throw involves spinning a

7.26

kg ball attached to a

1.21

m wire in a circle, and then throwing it as far as possible. During the spinning phase, if the ball is rotating with a speed of

14.3

m/s, what is the centripetal force that the wire exerts on the ball?

	1230 N
	884 N
	126 N
	85.8 N

25.

Imagine that you place a marble in a bowl, so that it rolls back and forth up the sides of the bowl. Eventually, the marble will lose its mechanical energy, and come to rest at the bottom of the bowl. Does this scenario violate the law of conservation of energy? Explain your answer.

26.

A certain moon orbits its planet, and its orbit has a radius of

1.14

10

5

km. If the planet has a mass of

8.45

10

26

kg, then what is the orbital period for the planet?

	2.66 10 10 s
	7.74 10 9 s
	2.42 10 10 s
	1.03 10 9 s

27.

A certain car has a mass of

1520

kg. The total area of contact between the tires and the ground is

0.0948

m

2

. What is the pressure the car is exerting on the road?

	1410 Pa
	3.39 10 5 Pa
	1.57 10 5 Pa
	1.60 10 4 Pa

28.

A box is placed on the floor of an elevator. As the elevator begins to accelerate upward, will the pressure the box exerts on the floor increase or stay the same? Explain your answer.

29.

Felipe is loading laboratory equipment into a storage crate. The fully loaded crate has a weight of

1110

N. The base of the crate is

1.05

m long by

0.875

m wide. What is the pressure exerted by the crate on the floor?

	1020 Pa
	1210 Pa
	490 Pa
	1110 Pa

30.

Jared is driving around a traffic circle. If he is traveling at a speed of

7.1

m/s, and it takes his

5.8

s to complete an entire loop around the traffic circle, what is the radius of the traffic circle?

	9.4 m
	7.1 m
	5.6 m
	6.6 m