Which statement correctly describes the role of gravity in galaxy formation?
A) Gravity makes the universe more uniform and smooth than it was at the beginning.
B) Gravity makes galaxies spin.
C) Gravity makes the dense regions denser.
D) Gravity slows down photons so they collect into galaxies.
C
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A refrigerator extracts 65 J of heat from a heat reservoir at
If the coefficient of performance of the refrigerator is 2.5, then how much work is needed to run the refrigerator?
A. 26 J B. 48 J C. 75 J D. 90 J
Galileo invented the telescope
a. True b. False Indicate whether the statement is true or false
If an object travels at a constant speed in a circular path, the acceleration of the object is
A) larger in magnitude the smaller the radius of the circle. B) in the same direction as the velocity of the object. C) smaller in magnitude the smaller the radius of the circle. D) in the opposite direction of the velocity of the object. E) zero.
How was the true rotation rate of Venus determined? Why does this make study of the Venusian surface hard for observers on the Earth?
What will be an ideal response?