A child takes a small plastic bucket full of water and swings the bucket over her head in a circular arc, just barely fast enough for the water to stay in the bucket. Unbeknownst to the child, a fish is in the middle of the water. At the top of the arc, the fish
A. has a downward acceleration
B. feels "weightless"
C. has zero net force acting on it
D. a and b
Answer: D. a and b
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What is the approximate size of the visible galaxy producing the jets?
What will be an ideal response?
Our whole galaxy is about ____ times larger in size.
A.) 100. B.) 1,000. C.) 10,000. D.) 100,000. E.) 1,000,000.
Photon Energy: An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its energy in a collision, what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
Fill in the blank(s) with the appropriate word(s).
The orbits of Population II stars have been compared to:
A) planets around the Sun. B) satellites around planets. C) comets around the Sun. D) binary stars. E) the accretion disk around a black hole.