The mechanical advantage of an inclined plane is the ratio of the inclined surface to the vertical height. Simple machines with greater mechanical advantage reduce the force required to lift a load. In which case is the effort required the LEAST?

Energy is the ability to do work which measures what

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?