Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 14 - Heat - Problems - Page 408: 6

Answer

$4.5\times10^5J$ or $110kcal$

Work Step by Step

The car’s initial kinetic energy is transformed into thermal energy. $$Q=\frac{1}{2}mv^2=\frac{1}{2}(1300kg)(\frac{95000m}{3600s})^2\approx 4.5\times10^5J$$ $$Q=(4.526\times10^5J)(\frac{1kcal}{4186J})\approx 110kcal$$
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