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I will appreciate your kind and best explanation for me. Thanks in advance. 18) Two identical...

I will appreciate your kind and best explanation for me. Thanks in advance.

18) Two identical piano wires have a fundamental frequency of 650 Hz when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 8 beats/s when both wires vibrate simultaneously?

25)  (a) A Carnot engine operates between a hot reservoir at 330 K and a cold reservoir at 270 K. If it absorbs 500 J of heat per cycle at the hot reservoir, how much work per cycle does it deliver? (b) If the same engine, working in reverse, functions as a refrigerator between the same two reservoirs, how much work per cycle must be supplied to remove 1000 J of heat from the cold reservoir?

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