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The problems/questions are multiple choice. Choose the single best answer - for numerical answers that means the closest to what you calculated. Each problem/question is worth fivepoints. Remember that once you hit submit on a problem/question, you can't go back and change your answer. Once you begin, you have 90 minutes to complete the test.

ze2-1Description:

Part A

What is the acceleration of the 8 kg mass?

ANSWER:

ze2-2Description:

Part A

Two blocks are being pulled across a rough surface by a force. What is the magnitude of the tension in the ideal green rope?

7.23 m/s2 down

9.80 m/s2 down

7.23 m/s2 down

4.68 m/s2 up

1.34 m/s2 up

4.68 m/s2 down

1.34 m/s2 down

9.80 m/s2 up

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ANSWER:

ze2-3Description:

Part A

A force pulls the two weights up with a constant speed. What is the tension in the massless green rope?

ANSWER:

1.4 N

3.2 N

6.3 N

2.3 N

4.7 N

7.7 N

5.6 N

8.5 N

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ze2-4Description:

Part A

The 50 kg block is released from rest. How long does it take to hit the floor?

ANSWER:

ze2-5Description:

Part A

The great basketball player, Lebron James, can jump incredibly high. Look, his head is as high as the rim! How does he do it?

187.5 N

125 N

200 N

25 N

245 N

100 N

1225 N

250 N

1.56 s

2.24 s

4.12 s

3.69 s

6.86 s

1.90 s

0.98 s

the masses remain stationary

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ANSWER:

ze2-6Description:

Part A

ANSWER:

He pushes down on the floor, which pushes back up on him. LeBron accelerates upward because the force of his push is equal to the force of floor's push.

He pushes down on the floor, which pushes back up on him. LeBron accelerates upward because the force of his push is greater than the force of floor's push.

He pushes down on the floor, which pushes back up on him. LeBron accelerates upward because the force of his push is equal to the force of gravity.

He pushes down on the floor, which pushes back up on him. LeBron accelerates upward because the force of his push is greater than the force of gravity.

No one knows; it's magic.

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ze2-7Description:

Part A

ANSWER:

ze2-8Description:

Part A

FBD a

FBD b

FBD c

FBD d

FBD a

FBD b

FBD c

FBD d

FBD e

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ANSWER:

ze2-10Description:

Part A

ANSWER:

ze2-11Description:

Part A

FBD a

FBD b

FBD c

FBD d

FBD e

a

b

c

d

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ANSWER:

ze2-12Description:

Part A

ANSWER:

ze2-13Description:

Part A

495 N

1350 N

1200 N

1475 N

980 N

a

b

c

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ANSWER:

ze2-15Description:

Part A

A rock with a mass of 0.5 kilogram is attached to one end of a rope that is 0.75 meters long. The rope will break if its tension exceeds 500 Newtons. The rock is spun in a horizontalcircle on a table which has no friction and the other end of the rope remains fixed. Find the maximum speed the rock can obtain without breaking the rope.

ANSWER:

ze2-16Description:

Part A

You and some friends attend your local county fair on a warm summer evening. Everyone rides the Ferris wheel which you notice is 10 m in diameter. You have brought along yourbathroom scale and sit on it during the ride. While riding, you notice that the reading on the scale drops exactly to zero when you move through the highest point on the ride. Whatis the period of rotation of the Ferris wheel?

ANSWER:

a

b

c

d

e

750.5 m/s

14.4 m/s

25.9 m/s

0.7 m/s

8.6 m/s

27.4 m/s

36.3 m/s

112.7 m/s

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ze2-17Description:

Part A

Assume that the coefficient of static friction between rubber tires and the road is twice the value on dry roads than it is on wet roads. There is a particular flat turn of radius r in yourtown. The maximum speed your car can negotiate the turn on dry pavement is v. What is the maximum speed your car can negotiate the turn on wet pavement?

ANSWER:

ze2-18Description:

Part A

A 2.5 gram block is placed 20 centimeters from the center of a turntable. The coefficient of static friction between the block and turntable is 0.70 and coefficient of kinetic frictionbetween the block and the turntable is 0.40. If the turntable starts turning very slowly and continually speeds up, at what RPM will the block slide off?

ANSWER:

ze2-19Description:

Part A

33.3 s

7.7 s

10.1 s

2.2 s

3.14 s

6.5 s

4.5 s

1.3 s

0.125v

v

0.5v

0.25v

0.33v

0.707v

2v

4v

78 RPM

6.28 RPM

91 RPM

56 RPM

12.3 RPM

45 RPM

72 RPM

33.3 RPM

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A typical Miami University red brick is resting on an Ohio University green incline as shown in the figure below. If the incline is rough, the magnitude of the friction force acting on theMU brick along the OU incline, is

ANSWER:

ze2-20 - newDescription:

Part A

A force is applied to a stationary object placed on the ground, as shown in the figure below. What is the heaviest possible massthe object is allowed to have, if it is to move at all?

ANSWER:

ze2-21Description:

Zero.

less than the weight of the brick.

greater than the weight of the brick.

equal to the weight of the brick.

Not enough information to answer the question.

82 kg

90 kg

73 kg

46 kg

59 kg

105 kg

68 kg

84 kg

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Part A

An (American) football is subject to the forces shown below. What is the magnitude of the football's acceleration? Don't forget gravity which is down.

ANSWER:

ze2-22Description:

Part A

A Miami Redhawk hockey player hits an official NHL puck on smooth blue ice. It travels 3.6 m, and then encounters rough orange ice. What is the total distance d travelled by thepuck?

ANSWER:

All Assignments

100 m/s2

139 m/s2

179 m/s2

119 m/s2

307 m/s2

49.7 m/s2

287 m/s2

83.7 m/s2

11.8 m

14.1 m

17.5 m

18.4 m

15.9 m

20.6 m

2.78 m

5.23 m

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Physics for Scientists and Engineers with Modern Physics, 4eKnight

alexander10003Ends: 12/19/20

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