một mẫu thử có đường kính d=20mm chiều dài thử l0=200mm chịu một lực kéo p=45mn độ dãn dài đàn hồi đo được l=200,017mm hãy tính modun đàn hồi khi kéo E

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.

What is the measurement of how fast an object moves relative to a reference point?

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.