How can we tell that some stars are relatively close to us in the sky?
a. Some stars are occasionally eclipsed by the Moon, so they must be nearby.
b. Some stars vary in brightness caused by sunspots we can see because they are so close.
c. Some stars appear to be extremely bright and must therefore be very close to us.
d. Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.
d
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The fact that gasoline overflows a full tank on a hot day is evidence that
A) gasoline expands more with increasing temperature than its tank. B) the tank contracts while gasoline expands with temperature. C) both of these D) neither of these
In a binary system, the more massive stars always stay closer to the center of mass and move slower
Indicate whether the statement is true or false
Describe two observational tests that support general relativity
What will be an ideal response?
An object of mass 4 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in Fig. 8-9
If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work is done by the force of friction? Use g = 10 m/s2. A) -100 J B) 100 J C) 0 D) -200 J E) 200 J