MIDTERM I PRACTICE

# MIDTERM I PRACTICE - Nicholas Charles Miller PHY183 Spring...

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Nicholas Charles Miller - PHY183, Spring 2010 - Physics for Scientists and Engineers I 1 Midterm 1 - Practice Nicholas Miller __________________________________ PRINT NAME: __________________________________ Do not open exam until instructed to do so.

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Nicholas Charles Miller - PHY183, Spring 2010 - Physics for Scientists and Engineers I 2 Midterm 1 - Practice
Nicholas Charles Miller - PHY183, Spring 2010 - Physics for Scientists and Engineers I 3 Midterm 1 - Practice Due date: Fri May 14 00:00:00 2010 From dimensional analysis considerations alone, mark these formulas as either ’valid’ or ’invalid’. Assume that x has dimensions of distance, v has dimensions of velocity, t has dimensions of time, g has dimensions of acceleration and m has dimensions of mass. Choices: valid , invalid . A. m ( x + 2 vt ) / (1 + 4 t ) = mgt 2 / 2 B. mv = 6 mgt/ (1 + 2 gt 2 /x ) Tries 0/99 A rock is hurled upward from a high bridge with an initial upward speed of 30 m/s. Eventually, the rock lands in the river, 50 m below the initial release point. For the following statements, displacements are measured relative to the release point and the upward direction is positive. Choices: True , False . A. At its highest point, the rock has zero velocity. B. At its highest point, the rock has zero acceleration. C. During the entire flight, the displacement of the rock is positive or zero. D. The maximum speed occurs on the way down at the instant when the rock passes the initial release point. Tries 0/99 Three identical airplanes with identical air speeds leave Williamston, Michigan with the intention of flying to Talla- hassee, Florida, which is directly south of Williamston. Airplanes A and B leave on Monday, when there is a strong wind from the west. The pilot of airplane A points the plane directly south and is blown off course, passing east of Tallahassee, while Airplane B adjusts its direction to account for the wind and flies directly to Tallahassee. Airplane C leaves on Tuesday, a calm and windless day, and flies directly south to Tallahassee.

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