Spring 2006- In office Diag

# Spring 2006- In office Diag - Scott Pratt PHY231 Spring...

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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 ( α = 12 × 10- 6 ◦ C- 1 ) and iron ( α = 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 flywheel’s rotational...
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Spring 2006- In office Diag - Scott Pratt PHY231 Spring...

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