An astronaut weighs 863 n on earth. what is the astronaut’s mass?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

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

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.