Physics Force, Time, Momentum and Rotation

timer Asked: Jan 31st, 2019
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Question Description

  1. a cart moving at 10 m/s is brought to a stop by the force plotted in the force-time graph shown here. find the impulse and the approximate mass of the cart. show all your work.

  1. a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. earth’s mass is 6.0 x 10^24 kg .show all your work, assuming the rock-earth system is closed.

  1. explain why a rapidly spinning gyroscope, mounted in a frame that allows it to rotate in any direction independently of the frame’s rotation, tends to maintain its axis pointed in the same direction in space.

Physics Force, Time, Momentum and Rotation

Tutor Answer

School: UCLA


Force, time, momentum, rotation
Question 1
Force x Time = Mass x Velocity
Ft= MV
From estimation, F=22N, Time = 4s
Impulse (MV)= 22 x 4 = 88Kgm/s
Mass = MV/V = 88kgm/s/10m/s = 8.8kg
Question 2
For the rock: P = mv
= (14) x (0...

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