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Final Exam Solutions

Ke and m are inversely related ketr 1 p2 mv 2 2 2m b

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Unformatted text preview: the answers of your choice. Each part is worth 4 points. [I] If two masses, m and M (M >m) have the same linear momentum, then: [a] the kinetic energy of m is less than the kinetic energy of M. [b] the kinetic energy of m is more than the kinetic energy of M. (KE and m are inversely related) KEtr = 1 p2 mV 2 = 2 2m [b] the kinetic energy of M is equal to the kinetic energy of m. [II] Which of the following statements is true? [a] If the angular momentum of a particle is zero, then its linear momentum must also be zero. [b] It is possible for two unequal masses to have equal moments of inertia about a common axis of rotation. (I = mr2, you can change r to get the same moment of inertia for two different masses) [c] If the net force acting on a rigid body is zero then the net torque on the rigid body must also be zero. [III]The work ­kinetic energy theorem (∆KE = ∆W12) is true: [a] only for conservative forces [b] only for non ­conservative forces [c] for all forces. [IV] A force F = 3i + 4j N is one of the forces applied to a mass M that undergoes a displacement d = -4i + 3j + 5k m. The net work done by F on M is: [a] 5.0 J. [b] zero (W = F.d = -3*4 + 4*3 = 0) [c] the...
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