Efficiency in converting food energy to mechanical energy
How many sprints from rest to a speed of 5.7 m/s would a 56-kg woman have to complete to burn off 5.0 X 10^2 Calories? (Assume 100% efficiency in converting food energy to mechanical energy. Ignore the energy expenditure of slowing down.)
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A beam of accelerated protons from the Large Hadron Collider can be used to "spray paint" an insulator with protons. Calculate the number of protons needed to paint the cover of your textbook with a charge density of 3 x 10-6 C/m2.
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