A piece of metal is pressed against the rim of a 3.2- kg, 18- cm-diameter grinding wheel that is turning at 2400 rpm. The metal has a coefficient of friction of 0.80 with respect to the wheel. When the motor is cut off, with how much force must you press to stop the wheel in 20.0 s

What is the angular speed in revolutions per minute (rpm) of a 16.9 g CD with a rotational period of 141 seconds? A 0.374 rpm B 0.213 rpm C 0.553 rpm D 0.511 rpm E 0.426 rpm

A speedboat with a mass of 505 kg (including the driver) is tethered to a fixed buoy by a strong 29.7 m cable. The boat's owner loves high speed, but does not really want to go anywhere. So the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 12300 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be (450 kg/m) × v², where v denotes the boat's speed. Ignore any drag force on the cable. force: N & TOOLS x10

You are on a Ferris Wheel that spins at 2.8 rpm. The ride is 29.8 m across. What is your apparent weight at the top of the ride if you have a mass of 87.6 kg?