Moore College of Art and Design Applying Newton Laws Questions

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Moore College of Art and Design

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1-

A 9.00-kgkg block of ice, released from rest at the top of a 1.09-mm-long frictionless ramp, slides downhill, reaching a speed of 2.94 m/sm/s at the bottom.

Part A

What is the angle between the ramp and the horizontal?

Part B

What would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 10.1 NN parallel to the surface of the ramp?

vv =

nothing

m/s

2-

A stockroom worker pushes a box with mass 12.0 kgkg on a horizontal surface with a constant speed of 3.30 m/sm/s . The coefIficient of kinetic friction between the box and the surface is 0.25.

Part A

What horizontal force must the worker apply to maintain the motion?

Express your answer with the appropriate units.

FF =


3-

A 50.0 kgkg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.00 turns each second. The distance from one hand to the other is 1.5 mm. Biometric measurements indicate that each hand typically makes up about 1.25 %% of body weight.

Part A

What horizontal force must her wrist exert on her hand?

FF =

NN

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Part B

Express the force in part (a) as a multiple of the weight of her hand.

FF =

w


.

4-o-

A rocket of initial mass 135 kgkg (including all the contents) has an engine that produces a constant vertical force (the thrust) of 1710 NN . Inside this rocket, a 12.5-NN electrical power supply rests on the floor.

Part A

Part complete

Find the initial acceleration of the rocket.

Express your answer with the appropriate units.

ainitialainitial =2.87 ms2ms2

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Correct

Part B

When the rocket has reached an altitude of 120 mm, how hard does the floor push on the power supply? Neglect the air resistance.

Express your answer with the appropriate units.

NN =


5--o---

A 8.60-kgkg block of ice, released from rest at the top of a 1.37-mm-long frictionless ramp, slides downhill, reaching a speed of 2.86 m/sm/s at the bottom.

Part A

What is the angle between the ramp and the horizontal?

ϕϕ =


Part B

What would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 10.6 NN parallel to the surface of the ramp?

vv =

nothing

m/sm/s


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Anonymous
Excellent resource! Really helped me get the gist of things.

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