Systems alone tend to move toward
A) order.
B) disorder.
C) temperature inversions.
D) none of the above
Answer: B
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The center of our galaxy contains a very intense source of radio and X-ray radiation named Sgr A*. What is it about this source that supports the idea that the radiation comes from a black hole? a. The radiation is strongly blueshifted, indicating that the object is collapsing
b. The radiation is strongly redshifted indicating that the object is growing. c. The radiation is coming from an incredibly small object. d. Radio waves can only be produced by matter orbiting a black hole. e. Only radiation from a black hole could penetrate the giant molecular clouds between Sgr A and Earth.
The net force on any object in equilibrium is
A) zero. B) equal to its weight. C) less than its weight. D) non-zero when motion is involved.
A black hole is a star whose gravitational field is so strong that light cannot escape from it
Indicate whether the statement is true or false
We have a hollow metallic sphere with charge +5.0 µC and radius 5.0 cm. We insert a -10 µC charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
a. +10 µC c. -5 µC b. +5 µC d. +15 µC