Jack pushed and pushed, but no matter how hard he tried, the refrigerator would not budge! what is the best explanation of what happened? a) jack exerted a force and did work. b) jack had no energy and did no work. c) jack used all his potential energy to do work. d) the refrigerator did not move so no work was done.
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Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).
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A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?
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Jack pushed and pushed, but no matter how hard he tried, the refrigerator would not budge! what is...
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