The mirrors for X-ray telescopes are the same shape as those of optical reflectors
Indicate whether the statement is true or false
FALSE
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The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is concentrated near the center of the galaxy. B) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk. C) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center. D) No, we cannot determine anything about the location of dark matter from the rotation curve.
The force required to move a 50.0 kg object in a circle with radius 55.0 m at a constant speed of 2.60 m/s is
a. 0.0 N b. 6.1 N c. 0.12 N d. 2.36 N
If the Moon is setting at noon, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
At a certain depth in the ocean, the absolute pressure is p. If you go to twice that depth (treating the water as incompressible)
A) the absolute pressure will be 2p. B) the absolute pressure will be less than 2p. C) the absolute pressure will be greater than 2p. D) the gauge pressure will not change. E) the gauge pressure will increase but will not double.