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Unformatted text preview: Physics 2A, Sec A00: Mechanics Winter 2011 Instructor: B. Grinstein Mid Term #2 (practice) INSTRUCTIONS: Use a pencil #2 to fll your scantron. Write your code number and bubble it in under "EXAM NUMBER;" an entry in error will result in an automatic 10% deduction. Bubble in the quiz Form (see letter A D at bottom oF page) in your scantron under "TEST ¡ORM;" an error entering the "test Form" will result in automatic 20% deductions, and may lead to disqualifcation. Write your name and 3 digit ID at the bottom oF this page and turn it in with your scantron when you are fnished working on the exam. 1) Two objects, one oF mass m and the other oF mass 2 m, are dropped From the top oF a building. When they hit the ground: A) the heavier one will have halF the kinetic energy oF the lighter one. B) the heavier one will have one Fourth the kinetic energy oF the lighter one. C) both will have the same kinetic energy. D) the heavier one will have twice the kinetic energy oF the lighter one. E) the heavier one will have Four times the kinetic energy oF the lighter one. 2) In the Following, K = kinetic energy, U = potential energy, and W = work. In using the expression K 2 + U 2 = K 1 + U 1 + W other we recognize that A) we are assuming no Friction is present. B) K and U can be either positive or negative, depending on the reFerence point chosen. C) Gravitational and elastic potential energies would be included in W other . D) W other is always positive. E) Gravitational and elastic potential energies would be included in U 1 andU 2 . 3) Determine the character oF the collision. The masses oF the blocks, and the velocities beFore and aFter are given. The collision is: A) perFectly elastic B) characterized...
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 Spring '09
 SHARMA
 Energy, Kinetic Energy, Mass, Potential Energy

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