Question

An experimentalist claims that, based on his measurements, a heat engine receives 300 Btu of heat from a source of 900 R, converts 160 Btu of it to work, and rejects the rest as waste heat to a sink at 540 R. Are these measurements reasonable? Why?

Answer 1

Answer:

Hook's law holds good up to. A elastic limit. B. plastic limit. C.yield point. D.Breaking point

Answer 2

The maximum efficiency must be greater than the actual efficiency of the heat engine. These measurements are not reasonable.

What is Efficiency?

The efficiency is defined as the work done by the engine divided by the heat supplied.

So, maximum efficiency η = 1 - T₁/T₂ = W/Qs

Where T₁ is the lower temperature and T₂ is the higher temperature.

An experimentalist claims that, based on his measurements, a heat engine receives 300 Btu of heat from a source of 900 R, converts 160 Btu of it to work, and rejects the rest as waste heat to a sink at 540 R

Substitute the value into the expression , we get

η = 1 -(540 / 900) x 100 %

η = 40 %

η  = Work done/heat supplied

Substitute the value into the expression , we get

η = 160/300 x 100 %

η = 53 %

So, the maximum efficiency must be greater than the actual efficiency of the heat engine.

Thus, these measurements are not reasonable.

Learn more about efficiency.

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