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Ball bearings can be made by letting spherical drops of molten metal fall in a tall tower - called a shot tower - and solidify as they fall.
1. If a bearing needs 4.0s to solidify enough for impact, how high should the tower be?
2. What is the bearing's impact velocity?
A plate carries a charge of -3.9 µC, while a rod carries a charge of 2.9 µC. How many electrons must be transferred from the plate
A gas expands from I to F. The energy added to the gas by heat is 442 J when the gas goes from I to F along the diagonal path. What is the change in internal energy of the gas.
the intensity in wm2 of one sound is 6.04 times as great as the intensity of another sound. relative to the quieter
A boy tosses a coin straight up to 2.4m. Suppose the height whenthe coin leaves his hand is 1.1m. What was the initial speed of thecoin when it left his hand
A uniform metal rod, with a mass of 3.4 kg and a length of 1.3 m, is attached to a wall by a hinge at its base. Find the vertical component of the force exerted on the rod by the hinge
a hot air balloon is rising upward with a constant speed of 15 ms. when the balloon is 5 m above the ground the
find the fraction of all the arrows you shoot that land outside a circle of some radius r0 as a function of r0. repeat
You push with a 20N horizontal force on a 2 kg mass resting on the horizontal surface against a horizontal friction force of 12N. What is the acceleration.
A particular banana contains 385 mg of potassium, of which a small fraction is the radioactive isotope _19^40 text (K) (see Appendix B). Approximation the activity of this banana because of _19^40 text (K).
The 20-g centrifuge at NASA's Ames Research Center in Mountain View, California, is a horizontal, Determine the rotation rate, in revolutions per second, required to give the astronaut a centripetal acceleration of 19.4g
Two 7.0kg bowling balls, each with a radius of 0.17m, are in contact with one another. What is the gravitational attraction between the bowling balls
A loudspeaker on a homecoming float - mounted on a pole -- is stuck playing at an annoying 210 Hz tone, What is the intensity of the signal at this point, What is the power of the speaker
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