Ahummingbird hovers by exerting a downward force on the air equal, on average, to its weight. by newton's third law, the air exerts an upward force of the same magnitude on the bird's wings. find the average mechanical power (in w) delivered by a 2.80 g hummingbird while hovering if its wings beat 70.0 times per second through a stroke 3.10 cm long.

4. 50x10= 500m/s 5. 52m/s

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.