If a gyroscope with I=0.265kgm2 with an initial angular velocity of 1250RPM takes 3.00 minutes to come to rest, what is the magnitude of the rotational torque? If the contact between the rotating object and the frame in which it is held is 0.5mm from the axis of rotation, what is the effective frictional force?

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1. If an object is rotating clockwise, this corresponds to a _____ angular velocity:

a- negative

b- positive

2. The angular displacement of a rotating object is measured in

a- degrees per second

b- degrees

c- radians

3. Which factor does the torque on an object NOT depend on?

a- the angle at which the force is applied

b- the object's angular velocity
c- the magnitude of the applied force

4. A net torque applied to an object causes __________.

a- the object to rotate at a constant rate
b- a linear acceleration of the object
c- the moment of inertia of the object to change
d- the angular velocity of the object to change

5. For an extended object, the weight force can be considered to act at which point?

a- At the center of gravity of the object
b- At the center of the object
c- At end of the object closest to the ground
d- At the end of the object farthest away from the ground

6. Moment of inertia is __________.

a- the rotational equivalent of mass
b- the point at which all forces appear to act
c- the time at which inertia occurs

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A merry go-round starts from rest and accelerates with angular acceleration 0.010red/s^2 for 14 sec. What is the rotational inertia of the merry-go-round if a constant tangential force of magnitude 200 N, applied 1 m from the axis of rotation, was required to accelerate it? What was the angular speed at the end of the spin-up time?

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