PHY180H1 Midterm: PHY180H1_20139_621386561411TT2soln
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Two objects of equal mass m collide elastically. After the collision, one object has velocity v1f , but the second object is no longer moving: v2f = 0. Assume the objects are constrained to move along a line. Express your answer in terms of m and v1f : [20 pts. ] A metallic weight with m = 4. 00 kg swings on a massless rod whose length is = 0. 500 m, under gravitational acceleration. At the bottom of its trajectory, the velocity is 8. 00 m/s. At some later time tf , the mass has swung through /4 angle (or. 45. 0 degrees) to a height h = (1 1/ 2). (a) [5 pts. ] What is the speed vf ? (b) [5 pts. ] What is the tangential acceleration at at time tf ? (c) [5 pts. ] How much work has been done by the rod on the mass, during this interval? (d) [5 pts. ]
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