quiz1soln

quiz1soln - by a motor and pulley system as shown. The...

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ME240(2,3): Quiz 1 Problem 2 . (30 points) The Center for Gravitational Biology Research at the NASA Ames Research Center runs a large centrifuge capable of simulating 20g of acceleration. The distance from the axis of rotation to the cab at A is r=8m . (a) Determine the angular velocity f needed to maintain a normal acceleration of 16g’s in cab A. (b) If the centrifuge accelerates uniformly from rest to reach f in t f =4sec , what tangential acceleration would be felt in cab A during start up?
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ME240(2,3): Quiz 1 Problem 3 . (45 points) The crate has a mass of 100 kg is being pulled up an inclined plane
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Unformatted text preview: by a motor and pulley system as shown. The static coefficient of friction s =0.6 and the kinetic coefficient of friction k =0.4. (a) What cable tension is needed to start the initially stationary crate sliding up the inclined plane? (b) What is the acceleration of the crate if the tension determined in (a) is maintained. (c) The motor is capable of a maximum cable retraction rate of 4m/s. How far will the crate travel up before the maximum retraction rate is reached? =30...
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quiz1soln - by a motor and pulley system as shown. The...

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