(((((QUESTION 1))))) Consider a particle of mass m = 20.0kg revolving around an

Question

(((((QUESTION 1)))))

Consider a particle of mass m = 20.0kg revolving around an axis with angular speed ?. The perpendicular distance from the particle to the axis is r = 0.750m . (Figure 1)

Part B

Assume ? = 11.0rad/s . What is the magnitude v of the velocity of the particle in m/s?

Part C

Now that you have found the velocity of the particle, find its kinetic energy K.

Express your answer numerically, in joules.

(((QUESTION 2))))

A fixed 0.16-kg solid-disk pulley with a radius of 0.080m is acted on by a net torque of 7.2m?N .

Part A

What is the angular acceleration of the pulley?

Express your answer using two significant figures.

Explanation / Answer

1B v=wr
=11*0.75
=8.25 m/s

1c K=(mv^2)/2
=(20*8.25*8.25)/2
=680.625 J

2A T=I?
?=2T/mr^2
=7.2*2/.16*.08*.08
=14062.5 rad/s2

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