The supermassive black hole at the center of the galaxy is:
A.) 15 light-years away.
B.) 300 light-years away.
C.) 8,800 light-years away.
D.) 26,000 light-years away.
E.) 90,000 light-years away.
Ans: D.) 26,000 light-years away.
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Which statement about asteroids is not true?
A) If we could put all the asteroids together, they would make an object about the size of Earth. B) Many but not all orbit the Sun in the asteroid belt. C) Some are more like loosely bound piles of rubble than solid chunks of rock. D) Most asteroids are not spherical in shape.
Suppose that the gravitational force by Earth on the moon suddenly shut off. How would the moon then move?
A) It would go into a larger circular orbit. B) It would move straight ahead in a straight line, at constant speed. C) It would move directly outward, away from Earth. D) It would slow down and stop. E) It would move directly inward, toward Earth.
At a distance of 4.3 cm from the center of a very long uniformly charged wire, the electric field has magnitude 2000 N/C and is directed toward the wire
What is the charge on a 1.0 cm length of wire near the center? (?0 = 8.85 × 10-12 C2/N ? m2) A) -0.056 nC B) -0.044 nC C) -0.048 nC D) -0.052 nC
A charge Q is positioned at the center of a sphere of radius R. The flux of the electric field through the sphere is equal to ?
If the charge Q is now placed at the center of a cube the flux of the electric field through the surface of the cube is equal to A) ?/2. B) ?. C) 2?. D) 0. E) The value of the flux depends on the dimensions of the cube.