28. does centripetal force do work on a rotating
obiect? (hint: consider the direction of cen-
tripetal force and the direction of motion.)
defend your answer.

Determine the maximum r-value of the polar equation r =3+3 cos 0

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.

What is the angular momentum of the bar about the axle?