Uniform Circular Motion: If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out. This happens because an outward force balances the pull of gravity on the water.
A. True
B. False
Answer: B
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Velma, inside a train moving at 20 m/s, throws a rock in the forward direction at 5 m/s. According to her the rock moves at 5 m/s. According to Mort, standing on Earth outside the train, the rock moves at [approximately] 25 m/s. Who is correct?
A) The Wizard of Oz. B) Velma, because she threw the rock. C) Mort, because he is standing on Earth. D) Both, relative to their own reference frames. E) Neither, because there is no universal "best" reference frame.
In a collision the total ____________ is the same before and after
Fill in the blank(s) with correct word
For a converging lens with two convex surfaces, the radius of curvature for both surfaces is 20 cm. If the focal length is 10 cm, what must the index of refraction be?
a. 1.5 c. 2.0 b. 2.5 d. 3.0
In a spectrum chart (like the one shown in figure Q11.2), the emission lines produced by a quantum harmonic oscillator
A. Get closer together (in energy) as we go to the right.
B. Are evenly spaced (in energy).
C. Get farther apart (in energy) as we go to the right.