00:01
Hello, students.
00:01
In this question, a gasoline engine is running an amount of gasoline containing heat q equals to 15 ,000 joules of chemical potential energy.
00:14
So this is actually chemical potential energy.
00:16
So suppose this is the potential energy pe, okay? and the work done w, it is equals to 3 ,000 joules in time t equals to one second.
00:28
So for the part a, we have to calculate the engine's efficiency e.
00:34
So the engine's efficiency e, it is equals to energy or work output.
00:40
So w divided by energy or work input, that is potential energy, multiplied by 100%.
00:46
So e, it is equals to work done, which is 3 ,000 joule, and potential energy, which is 15 ,000 jule multiplied by 100%.
00:56
So efficiency e comes out to be 20%...