rupinder midterm 2-C 2011 solns

rupinder midterm 2-C 2011 solns - the Astronaut after she...

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1. A massless spring has a spring constant of 450 N/m and is placed vertically on the floor. You use a 3.5 kg mass to push down on the spring, compressing it by 19 cm from equilibrium. You then release the mass and the spring fires the mass straight up. (a) What is the height above the equilibrium position the mass reaches? (b) What speed is the mass moving at the spring’s equilibrium? (c) If you tried doing this problem by compressing the spring by 3.0 cm and releasing, the block would not launch. Explain why in words.
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2. Aboard the International Space Station a 75.0 kg Astronaut holding a 12.5 kg toolbox “floats” toward the right at a speed of 0.750 m/s. The Astronaut throws her toolbox to a nearby Cosmonaut, who is 30.0° above the path of the Astronaut with a speed of 4.00 m/s. What is the resulting velocity (including direction) of
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Unformatted text preview: the Astronaut after she throws the toolbox? 3. A grinding wheel in the form of a uniform solid disk of radius 17.0 cm and mass 10.0 kg is initially at rest. Two forces are then applied to the wheel, as shown below. (a) What is the magnitude and direction of the subsequent angular acceleration? (b) How many revolutions has it made it the first 4.00 seconds? (c) What is the linear speed of a point at the edge of the wheel 9.00 seconds after the 4. 92 kg Rupinder slides down a diagonal slide that is 3.0m high and inclined by 33°. He starts at rest at the top of the slide and ends at the bottom with a velocity of 5.50 m/s. What is the force of kinetic friction between Rupinder and the slide? You must use work and energy for this problem....
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rupinder midterm 2-C 2011 solns - the Astronaut after she...

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