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Spring 2008

# Spring 2008 - David Scott Selis PHY231 Spring 2008 Int...

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David Scott Selis - PHY231, Spring 2008 - Int 1 MIDTERM 1C David Selis Do not open exam until instructed to do so.

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David Scott Selis - PHY231, Spring 2008 - Int 3 MIDTERM 1C 2 pt Consider A=48 m and B=2 s 2 . Please identify if the operations below are dimensionally valid, and if they are, whether or not the answer given is correct. You can subtract B from A and get 46 m. 1 . A circlecopyrt Dimensionally invalid operation B circlecopyrt Valid operation, but the answer is incorrect C circlecopyrt This is correct You can divide A by B and get 24 m/s 2 . 2 . A circlecopyrt Dimensionally invalid operation B circlecopyrt Valid operation, but the answer is incorrect C circlecopyrt This is correct You are correct. Your receipt is 154-7132 4 pt A student hurls a baseball directly upward with an ini- tial speed of 40 m/s. Later, the student catches the baseball at the same position from which it was released. For the following statements, displacements are measured relative to the release point and the upward direction is positive. During the entire flight, the acceleration of the baseball is negative. 3 . A circlecopyrt True B circlecopyrt False At its highest point, the baseball has zero velocity. 4 . A circlecopyrt True B circlecopyrt False During the entire flight, the displacement of the baseball is positive or zero. 5 . A circlecopyrt True B circlecopyrt False During the entire flight, the velocity of the baseball is pos- itive or zero. 6 . A circlecopyrt True B circlecopyrt False You are partially correct. Your receipt is 154-5745 2 pt Three balls are thrown from the top of a building with identi- cal initial speeds. The initial velocities of Ball 1 is horizontal while that of Ball 2 is 30 degrees above the horizontal, and that of Ball 3 is thirty degrees below horizontal. Order the three balls (highest to lowest) according to the horizontal component of their velocities when they hit the ground. 7 . A circlecopyrt Ball 1 : Ball 2 : Ball 3 B circlecopyrt Ball 1 : Ball 3 : Ball 2 C circlecopyrt Ball 2 : Ball 3 : Ball 1 D circlecopyrt Ball 2 : Ball 1 : Ball 3 E circlecopyrt Ball 3 : Ball 1 : Ball 2 F circlecopyrt Ball 3 : Ball 2 : Ball 1 G circlecopyrt Ball 1 : Ball 2 & Ball3 tie H circlecopyrt Ball 2 & Ball 3 tie : Ball 1 I circlecopyrt All three balls tie Order the three balls (highest to lowest) according to the speeds with which they hit the groud.
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Spring 2008 - David Scott Selis PHY231 Spring 2008 Int...

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