An engine extracts 441.3kj of heat from the burning of fuel each cycle, but rejects 259.8 kj of heat (exhaust, friction, etc) during each cycle. what is the thermal efficiency of the engine?

Explanation:

We know that the thermal efficiency is the ratio of work done by the engine over the heat taken

Now, how much work the engine do in a cycle?

We know that the work done in a cycle must be equal to the heat taken minus the heat rejected

So, the thermal efficiency will be:

Putting the values of the problem

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.