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Physics, 16.01.2021 04:30 tfonarov

2. You can start a campfire by rubbing two dry sticks together. To create sparks, rest the larger stick on the ground. Press the point of the smaller stick into the
larger stick so that the sticks are at right angles. You then rotate the smaller
stick between your hands. Suppose you begin to see smoke when you rotate the
stick so that you transfer a kinetic energy of 2.15 x 10^J. What is the internal
energy at the point where the sticks meet?

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