Potential energy of falling weights becomes kinetic energy of paddle. The paddle's kinetic energy in turn becomes internal energy of the water indicated by rising temperature FIGURE 13.1 Joule's apparatus for measuring what he called "the mechanical equivalent of heat."

Potential energy of falling weights becomes kinetic energy of paddle. The paddle's kinetic energy in turn becomes internal energy of the water indicated by rising temperature FIGURE 13.1 Joule's apparatus for measuring what he called "the mechanical equivalent of heat."

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter11: Energy In Thermal Processes

Section: Chapter Questions

Problem 13P: A certain steel railroad rails 13 yd in length and weighs 70.0 lb/yd How much thermal energy is...

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Question

The masses of the two weights are both equal to .5 kg. (neglect any inertia of the rest of the apparatus.) The masses fall 8 meters. Assume the mass of the water is 0.1 kg, and the water absorbs 85% of the heat. Calculate the rise in temperature of the water in degrees Celsius. Show all equations and show all work typed show final answer in deg C

Potential energy of
falling weights
becomes kinetic
energy of paddle.
The paddle's kinetic energy in turn
becomes internal energy of the water
indicated by rising temperature
FIGURE 13.1 Joule's apparatus for measuring
what he called "the mechanical equivalent
of heat."

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