The 8.7-kg wheel with a radius of gyration of 200 mm about its center O is released from rest on the incline. If the wheel rolls without slipping, what is the minimum coefficient of friction μs?

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque