Pulley A requires 100 J of input work, but has an output work of 75 J. Pulley B requires 100 J of input work, but has an output work of 80 J.

What is the efficiency percentage of pulley A?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Aball horizontally thrown from a cliff at 8m/s