Posted by **Josh** on Saturday, January 11, 2014 at 6:44pm.

Two uniform solid spheres have the same mass of 3 kg, but one has a radius of 0.25 m while the other has a radius of 0.8 m. Each can rotate about an axis through its center.

(a) What is the magnitude τ of the torque required to bring the smaller sphere from rest to an angular speed of 300 rad/s in 15 s?

N·m

(b) What is the magnitude F of the force that must be applied tangentially at the sphere's equator to provide that torque?

N

(c) What is the corresponding value of τ for the larger sphere?

N·m

(d) What is the corresponding value of F for the larger sphere?

N

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