If three boys are pushing on a 20 kg cart, each with 15 newtons of force, and a horse is pulling the cart in the opposite direction with 45 newtons of force, what is the acceleration of the cart?

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?

The plum pudding model of the atom state that ?

What are igneous intrusions and extrusions