Which refers to the ratio of output work to input work of a machine expressed as a percent? total work
wattage
efficiency
power

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

Debris produced by mining is called

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?