Five hundred joules of heat are added to a closed system. the initial internal energy of the system is 87 j, and the final internal energy is 134 j. how much work is being done by the system?

We can solve the problem by using the first law of thermodynamics:

where

is the variation of internal energy of the system

Q is the heat added to the system

W is the work done by the system

In this problem, the variation of internal energy of the system is

While the heat added to the system is

therefore, the work done by the system is

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue