The lightweight wheel on a road bike has a moment of inertia of 0.097 kg⋅ m 2 . a mechanic, checking the alignment of the wheel, gives it a quick spin; it completes 5 rotations in 2 s . to bring the wheel to rest, the mechanic gently applies the disk brakes, which squeeze pads against a metal disk connected to the wheel. the pads touch the disk 7.1 cm from the axle, and the wheel slows down and stops in 1.4 s . what is the magnitude of the friction force on the disk?

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.