:why are shooting stars bright? a. meteors use up the energy inside them and burn out before falling to earth’s surface. b. sun reflects off ice melting in the meteor. c. light is given off as the falling meteor rapidly heats in earth’s atmosphere.

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

Name the non metal condut electricity

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.