Answer to Question #208987 in Physics for Shiela Nerido

Question

As you walk to your school, you have done 2.00 x 105 J of work and lost

3.00 x 105 J of internal energy.

(a) How much of the internal energy was converted into heat?

(b) Is it added or removed? Explain.

Answer 1

(a) According to the first law of thermodynamics:

$$Q=\Delta U+A=5.00·10^5\text{ J}.$$

(b) Removed because adding this heat would violate the conservation of energy.