p140f04_exam_3_practice_sol

# p140f04_exam_3_practice_sol - Physics 140 Fall 2004...

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Unformatted text preview: Physics 140 Fall 2004: Practice Exam #3 Solutions Please print your name:_____________________________________________ Please list your discussion section number:______________________________ Please list your discussion instructor:___________________________________ Form #1 Instructions 1. Fill in your name above 2. This will be a 1.5 hour, closed book exam. The exam includes 20 questions. 3. You may use a calculator, please do not share calculators 4. You may use three 3”x5” note card with notes and equations you think may be useful. You can write on both sides of the card if you like. 5. You will be asked to show your University student ID card when you turn in your exam. ID checked by:___________________________________ Discussion section reminder: Section 004 M/W 8:00-9:00 Don Smith Section 005 M/W 9:00-10:00 Don Smith Section 006 M/W 10:00-11:00 Don Smith Section 007 M/W 9:00-10:00 Roy Clarke Section 008 M/W 10:00-11:00 Roy Clarke Section 009 M/W 11:00-12:00 Roy Clarke Section 010 M/W 12:00-1:00 Don Smith Section 011 M/W 1:00-2:00 Don Smith Section 012 M/W 2:00-3:00 Don Smith Section 013 M/W 10:00-11:00 Carl Akerlof Section 014 M/W 11:00-12:00 Carl Akerlof Section 015 M/W 12:00-1:00 Jay Chapman Section 023 M/W 1:00-2:00 Noemi Mirkin Section 024 M/W 2:00-3:00 Noemi Mirkin 1: Katie went to her outside faucet to fill a 0.032 m 3 bucket with water to wash her car Water exits her faucet with a speed of 0.64 m/s. The radius of the faucet is 0.75 cm. How long does it take to fill the bucket completely? a) 3.0 s b) *280 s c) 6 s d) 140 s e) 320 s 2. A 10 kg box is at rest at the end of an unstretched spring with constant 4000 N/m. The mass is struck with a hammer giving it a velocity of 6 m/s to the right across a frictionless surface. What is the amplitude of the resulting oscillation of this system? a) 0.09 m b) *0.30 m c) 0.60 m d) 0.45 m e) 0.18 m The flow rate out of the faucet is π r 2 *v = 1.13x10-4 m 3 /s. The total volume of the bucket is 0.032 m 3 , so it will take 280 seconds to fill. That’s a long time, but then the faucet has a pretty narrow outlet… Right after the block is struck it has a kinetic energy of 1/2mv 2 = 180 J. At this point, the spring is uncompressed and it has no elastic potential energy. When the string is fully compressed all that kinetic energy will be converted to elastic potential energy, so 1/2mv in 2 = 1/2kx max 2 . Putting in the numbers, we find: x max = 0.3m 3. A uniform board is leaning against a smooth (frictionless) vertical wall. The board is at an angle θ above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.650. Find the smallest angle θ , such that the lower end of the board does not slip along the ground....
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## This homework help was uploaded on 04/04/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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p140f04_exam_3_practice_sol - Physics 140 Fall 2004...

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