Determine the smallest couple moment that can be applied to the 150-lb wheel that will cau...

Determine the smallest couple moment that can be applied to the 150-lb wheel that will cause impending motion. The uniform concrete block has a weight of 300 lb. The coefficients of static friction are µA = 0.2, µB = 0.3, and between the concrete block and the floor, µ = 0.4.