The mass of the sun is 1.99x1030 kilograms and its distance from Earth is 150 million kilometers(1.50x1011 meters). What is the gravitational force between the sun and Earth? Earth has a mass of 5.97x1024 kg

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

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?

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?