5. Sean spins a ball in a horizontal circle on a weigh-less string. Justin has a similar ball but wants to spin his slower. What could Justin do to make it harder to start spinning the mass from rest? a. make the string longer b. use a lighter ball c. spin the ball closer to the ground d. make the string shorter
5. Sean spins a ball in a horizontal circle on a weigh-less string. Justin has a similar ball but wants to spin his slower. What could Justin do to make it harder to start spinning the mass from rest? a. make the string longer b. use a lighter ball c. spin the ball closer to the ground d. make the string shorter
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Transcribed Image Text:5. Sean spins a ball in a horizontal circle on a weigh-less string. Justin has a similar ball
but wants to spin his slower. What could Justin do to make it harder to start spinning
the mass from rest?
a. make the string longer
b. use a lighter ball
c. spin the ball closer to the ground
d. make the string shorter
6. A fan initially rotates clockwise at 9.0 rad/s, but has a counterclockwise angular
acceleration of 3.0 rad/s? and reaches a counterclockwise angular speed of 27 rad/s.
How much time did this change in the angular velocity take?
a. -9 s
b. -12 s
C. 9 s
d. 12 s
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