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A Carnot engine has 40 g of helium gas as its working substance. It operates between two reservoirs of temperatures T1 = 400°C and T2 = 60°C. The initial volume of the gas is V1 = 2.0 X 10-2 m3, the volume after isothermal expansion is V2 = 4.0 X 10-2 m3, and the volume after the subsequent adiabatic expansion is V3 = 5.0 X 10-2 m3.
(a) Calculate the work generated by this engine during one cycle.
(b) Calculate the heat absorbed and the waste heat ejected during one cycle.
A bucket filled with dirt of mass 20 kg is suspended by a rope that hangs over a pulley of mass 30 kg and radius 0.25 m. Everything is initially at rest.
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A large balloon of mass 220 kg is filled with helium gas until its volume is 321 m3. Calculate the buoyant force acting on the balloon
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