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EXAM_2_&ndash;_Fall2011_Practice[1]

# A block of mass 10 kg is being pulled across the

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Unformatted text preview: e for the decrease in gravitational potential energy. D) The air increases in temperature due to heat exchange, Q. E) The Earth’s kinetic energy increases in order to compensate for the decrease in potential energy. Problem 3. A block of mass 10 kg is being pulled across the floor at constant velocity by a rope. The tension in the rope is 20N and the rope is at an angle of 25˚ above the horizontal. Find the force that the floor exerts on the block. 25˚ 20 N A) < ­18.1, 89.5, 0> N B) <9.23, 21.6, 0> N C) < ­8.45, 79.9, 0> N D) < ­2.43, 94.2, 0> N E) <6.78,  ­98.0, 0> N Problem 4. A proton and an electron are far apart at rest. An external agent brings the electron and proton closer together and then holds them at rest. Which statement is correct about the work done by the external agent? A) The work done is negative....
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