If the mass-spring system remained at rest, by how much would the mass stretch it from its normal equilibrium position? the acceleration of gravity is 9. 8 m/s 2.

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.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Why does a collision with an airbag cause less damage than a collision with a steering wheel