rupinder midterm 1-A 2011 solns

rupinder midterm 1-A 2011 solns - building 33 m high with a...

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1. Rupinder is standing on a bridge overlooking a river. (a) He throws a 25 g rock straight up into the air with a speed of 12 m/s and measures that it takes 6.8 s to hear a splash. How high is the bridge? (b) Now that he knows how high the bridge is, Rupinder throws two identical rocks at 5.5 m/s, one upwards and one downward. How long apart are the two splashes? (c) What is the difference in speed of the two rocks when they each hit the water?
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2. In a centrifuge of radius 8.5 m, astronauts are spun around at high speeds. The centrifuge is running at 55 rpm at full speed and then comes to a rest in 23.5 seconds. (a) What is the angular acceleration of the centrifuge as it comes to a stop? (b) How many rotations does it make while it is stopping? (c) What is the highest total acceleration felt by a passenger?
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3. Spider-man leaps off of a
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Unformatted text preview: building 33 m high with a speed of 9.5 m/s, 23 below the horizontal, toward an adjacent building 19 m away. Does he land on the next building or on the ground? How far up the building or away from the adjacent building will he land? 4. A mass of m A = 45.0 kg and a mass of m B = 39.0 kg are attached by a light cord which passes over a frictionless, negligible mass pulley, as shown in the figure below. Mass B is being pulled to the right by a 65 kg person resulting in the entire system moving to the right/up the incline with an acceleration of 1.0 m/s 2 . Mass A lies on an inclined ramp of 35.0 degrees. The coefficient of kinetic friction between the blocks and the surface is 0.15. (a) Draw the free-body diagrams (Do not draw on the figure or in the box). (b) With what force is the person pulling?...
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This note was uploaded on 02/25/2012 for the course SCIENCE 1010 taught by Professor Rupinderbrar during the Fall '11 term at UOIT.

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rupinder midterm 1-A 2011 solns - building 33 m high with a...

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