7. Based on Student I's explanation, the same substance composes both of the samples in which of the following
pairs?
A. Samples A and B
B. Samples B and C
C. Samples C and D
D. Samples D and 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.

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?