(((QUESTION 1))) Part A What net torque is required to give a uniform 20-kg soli

Question

(((QUESTION 1)))

Part A

What net torque is required to give a uniform 20-kg solid ball with a radius of 0.21m an angular acceleration of 12rad/s2 ?

Express your answer using two significant figures.

(((QUESTION 2)))

You wish to accelerate a small merry-go-round from rest to a rotational speed of one-half of a revolution per second by pushing tangentially on it. Assume the merry-go-round is a disk with a mass of 250kg and a radius of 1.80m .

Part A

Ignoring friction, how hard do you have to push tangentially to accomplish this in 7.00s ? (Use energy methods and assume a constant push on your part.)

Explanation / Answer

Torque T = Mom.of inertia (I) x ang.accel (?) (equivalent to F = m x a)

Mom. of inertia for solid sphere = 0.4 mr

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.