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Unformatted text preview: Scott Pratt- PHY231, Spring 2006 - Introduct 1 Midterm 3 (lecture students) 4 pt A figure skater is spinning with her arms and one leg extended as far as she can. She then pulls them in tight to her body. As her position contracts, . her angular momentum . 1 . A decreases B increases C remains the same . her angular velocity . 2 . A decreases B increases C remains the same . her moment of inertia . 3 . A decreases B increases C remains the same . her rotational kinetic energy . 4 . A decreases B increases C remains the same 1 pt The bimetallic strip above is made of copper ( = 12 10- 6 C- 1 ) and iron ( = 17 10- 6 C- 1 ). When this strip is held down at the left end and heated, it will . 5 . A bend downward B bend upward C remain straight, while stretching its length 3 pt An incompressible fluid moves through the pipe shown above from RIGHT to LEFT. The pipe widens from a diameter of 3 cm at B to a diameter of 5 cm at A. (Assume non-viscous laminar flow) . The speed of the fluid at A is the speed of the fluid at B. 6 . A equal to B greater than C less than . The amount of fluid that passes A in one second is the amount of fluid that passes B in one second. 7 . A equal to B greater than C less than . The pressure at A is the pressure at B. 8 . A equal to B greater than C less than 2 pt A hot (800 K) and a cold (200 K) object are connected by two aluminum bars as shown. . Compared to the configuration on the left, the rate of heat transferred in configuration shown the right is as high. 9 . A one fourth B one half C one third . Considering the left configuration only, lowering the tem- perature of the 800 K block to 400 K will reduce the rate of heat transfer by a factor of . 10 . A one fourth B one half C one third Scott Pratt- PHY231, Spring 2006 - Introduct 3 Midterm 3 (lecture students) 1 pt A car is designed to get its energy from a rotating flywheel with a radius of 1.85 m and a mass of 525 kg. The flywheel is shaped like a pancake and can be considered as a uniform cylinder. Before a trip, the flywheel is attached to an electric motor, which brings the flywheels rotational...
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- Spring '08