A girl pulls a loaded sled with mass m = 40 kg on some horizontal snowy pavement with 115 N of force. The velocity of the sled is constant. The coefficient of kinetic friction μk between the runner and the pavement is 0.3 and the angle θ between the cord and the pavement is 20°. Find the magnitude of the normal force by which the sled affects the pavement. Find the magnitude of the friction force that affects the sled.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.