Applying Newton’s Laws
Applying Newton’s Laws.
I need an explanation for this Physics question to help me study.
1

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
N
N
parallel to the surface of the ramp?


v = 
nothing 
m/s 
2
A stockroom worker pushes a box with mass 12.0 kg k g on a horizontal surface with a constant speed of m / s . The coefIficient of kinetic friction between the box and the surface is 
Part AWhat horizontal force must the worker apply to maintain the motion? Express your answer with the appropriate units.

3
A 50.0 kg k g 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 m . Biometric measurements indicate that each hand typically makes up about 1.25 of body weight. 
Part AWhat horizontal force must her wrist exert on her hand?
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Part BExpress the force in part (a) as a multiple of the weight of her hand.

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4o
A rocket of initial mass 135 kg k g (including all the contents) has an engine that produces a constant vertical force (the thrust) of N . Inside this rocket, a N electrical power supply rests on the floor. 
Part APart complete Find the initial acceleration of the rocket. Express your answer with the appropriate units.
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Part BWhen the rocket has reached an altitude of m , how hard does the floor push on the power supply? Neglect the air resistance. Express your answer with the appropriate units.

5–o—
A 8.60 kg k g block of ice, released from rest at the top of a 1.37 m long frictionless ramp, slides downhill, reaching a speed of 2.86 m / s at the bottom. 
Part AWhat is the angle between the ramp and the horizontal?
Part BWhat would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 10.6 N parallel to the surface of the ramp?
