A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. What is the thermal efficiency of this heat engine?

Explanation:

Given data

Temperature T1=270K

Temperature T2=650K

Work=4.3 kJ

Heat rejects=8.0 kJ

To find

Thermal efficiency

Solution

The thermal efficiency is given as:

For Carnot cycle efficiency

For real cycle efficiency

So the thermal efficiency is:

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

it is b. absorbs thermal energy