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Home Q & A Board Science-Related Homework Help Physics
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gerrard gerrard
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12 years ago
1.  Ana-Lucia needs to sink the 8-ball to win a pool match.  She can sink it by hitting the 8-ball so it travels 35° away from the original path of the cue-ball.  At what angle does the cue-ball deflect after hitting the 8-ball?  Show the angle by using the conservation of kinetic energy, conservation of momentum and assume the masses are equal.  See lecture 14 for a diagram and how to set the problem up.

2.  A sanding disk with moment of inertia 1.2×10-3 kg • m2 is attached to an electric drill whose motor delivers a torque of 16 N • m. Find (a) the angular momentum of the disk about its central axis and (b) the angular speed of the disk 33 ms after the motor is turned on.

3.  Your friendly neighborhood Spider-man is pinned under a 17500 kg city bus.  He then lifts it straight over his head to escape.  What is the Young’s modulus on Spider-man’s femur if it has a radius of 4 cm and contracts from 45.7 cm to just 45.3 cm under the weight?  (Let’s see a nice diagram for this one)
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bio_manbio_man
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