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PHYSICS.I.PRACTICE.PROBLEMS.SET.2.1
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PRACTICE PROBLEMS SET 2.1
1.
A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is
6.9 m above the ground. What is the mass of the box?
4.7 kg
3.1 kg
5.2 kg
5.2 kg
abcd
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2. A futuristic design for a car is to have disklike flywheel within the car storing kinetic energy. The flywheel has
mass 370 kg with a radius of 0.50 m and can rotate up to 340 rev/s. Assuming all of this stored kinetic energy could
be transferred to the linear velocity of the 3200kg car, find the maximum attainable speed of the car.
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3. A pitcher is employing a ballistic pendulum to determine the speed of his fastball. A 5.3 kg lump of clay is
suspended from a cord 2.0 m long. When the pitcher throws his fastball aimed at the clay, the ball becomes embedded
in the clay and the two swing up to a maximum height of 0.10 m. If the mass of the baseball is 0.21 kg, use
conservation of momentum and energy to find the speed of the pitch.
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This note was uploaded on 09/02/2010 for the course PHYS MERR1 taught by Professor Carter during the Spring '10 term at UMass (Amherst).
 Spring '10
 Carter
 Physics, mechanics, Work

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