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. March 2019

Heat and Thermodynamics

Q- A piston-cylinder device contains N2 gas, initially at 1.5 bar, 200C, 0.05 m3. The gas is now compressed in a polytropic process, PVn = constant, to 4 bar, 1500C. Determine the polytropic exponent ‘n’, the work done on the gas and the heat transfer.

Solution:

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Standing Waves

Q- One of the 63.5 cm long strings of an ordinary guitar is tuned to produce the not B (frequency 245 Hz) when vibrating in its fundamental mode.

(a) find the speed of the transverse wave on this string.

(b) If the tension in the string is doubled, what will be the new fundamental frequency of the…

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