Airbags and safety belts can reduce injuries because they can A. increase the momentum after collision
B. increase the time of collision
C. reduce the velocity of collision
D. reduce the inertia

and why? ​

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.