What is the period of a spring that oscillates with a frequency of 2.09 hz

Which statement about covalent bonds is true

True or false: the revolution of the earth creates day and night as it rotates around the sun

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.