The 500 kg car travelling at 25 m s-1 collides head-on with another of mass 800 kg travelling at 18 m s-1 in the opposite direction and they move together after impact. What is the magnitude of their velocity just after impact and in what direction do they move off?

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

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.