ENGINEERING FUNDAMENTALS
ENGINEERING FUNDAMENTALS
6th Edition
ISBN: 9781337705011
Author: MOAVENI
Publisher: CENGAGE L
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Chapter 8, Problem 43P
To determine

Find the deceleration of the motor and the number of turns of motor before it stops.

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A grindstone in the shape of a solid disk with diameter 0.520 m and a mass of 50.0 kg is rotating at 850 rev/min. You press an axe against the rim with a normal force of 160 N (see Figure below), and the grindstone comes to rest in 7.50 s. What is the moment of inertia of the grindstone? What force is bringing the grindstone to a stop?  What is the net torque caused by that force? What is the size of the force? What is the coefficient of friction between the axe and the grindstone?
You are coasting on your 10-kg bicycle at 15 m/s and a 8.0-g bug splatters on your helmet. The bug was initially moving at 4.0 m/s in the same direction as you. If your mass is 70 kg, (a) what is the initial momentum of you plus your bicycle? (b) What is the initial momentum of the bug? (c)What is your change in velocity due to the collision with the bug? (d) What would the change in velocity have been if the bug were traveling in the opposite direction?
5. A train changes its speed uniformly from 60mph (miles per hour) to 30mph in a distance of 1500ft. What is the acceleration? Express your answer in ft/s2.
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