In the equation ac= v2/r for centripetal acceleration, the v stands for
a. volume.
b. very.
c. speed.
d. velociraptor.
c
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Lenz's Law: A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is pulled upward, what is the direction of the current induced in the ring, as viewed from above?
A. There is no current in the ring. B. counterclockwise C. clockwise
The pressure at the bottom of aquarium A is greater than that at the bottom of aquarium B. Why might this be?
a. A is filled with fresh water, B has the same amount of salt water. b. A is filled to a greater depth than B. c. A has greater volume than B. d. The bottom of aquarium A has smaller area than that of B. e. none of the above
A nova is a new star
a. True b. False Indicate whether the statement is true or false
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the Moon, 384,000 km away. What is the radius of the big red spot on the Moon?
a. 500 m b. 250 m c. 120 m d. 1.0 km e. 2.7 km