A person hums into the top of a well (tube open at only one end) and finds that standing waves are established at frequencies of 41.2, 68.7, and 96.2 Hz. The frequency of 41.2 Hz is not necessarily the fundamental frequency. The speed of sound is 343 m/s. How deep is the well?

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

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.

Which best describes the difference between internal and thermal energy?