## Fundamentals of Physics Extended (10th Edition)

Published by Wiley

# Chapter 8 - Potential Energy and Conservation of Energy - Questions: 7b

#### Answer

$\Delta$$E_{th}$=+30 Joules

#### Work Step by Step

The total Work done on the system is +200J. +60 Joules of work is preformed on the block, and +130 Joules of kinetic energy is introduced. This is a total of 190 Joules. Because the cylinder is pulled down, potential gravitational energy decrease (-20 Joules). The total is now 170 Joules. The only factor left un-calculated is thermal energy, so it must fill in the gap. 200-170= +30 Joules.

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