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Q1. A uniform disk can rotate around its center like the merry-go-round. The disk has a radius of 2.00cm and a mass of 20.0grams and is firstly at rest. Starting at time t=0, two forces are to be applied tangentially to the rim in. One clockwise the other Counter clockwise. At time t=1.25 s the disk has an angular velocity of 250 rad/s counter clockwise. The clock wise force has a magnitude of 0.100 N. What is the magnitude of the counter clockwise force?

Q2. A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 5.0 x 10^6 g at a distance of 4.00cm from the axis. What angular velocity in rev/min is necessary?

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