Aball is dropped from the top of a 46.0 m -high cliff. at the same time, a carefully aimed stone is thrown straight up from the bottom of the cliff with a speed of 22.0 m/s . the stone and ball collide part way up.
how far above the base of the cliff does this happen?

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Why is metal often used for cooking pan?

What are atoms of the same element with varying number of neutrons