An object covers a distance of 25 meters within 9 seconds. how fast is the object ?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.