A turntable A is built into a stage for use in a theatrical production. It is observed dur...

A turntable 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 12 s after the turntable begins to rotate. Knowing that the trunk undergoes a constant tangential acceleration of 0.75 ft/s2, determine the co- efficient of static friction between die trunk and the turntable.