The force on a charged object divided by the charge on the object is
a. voltage
b. current
c. resistance
d. electric field
e. critical temperature
D
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In reply to a student's question, a guard in a natural history museum says of the fossils near his station, "When I started work here twenty-four years ago, they were 80 million years old, so you can add it up." Which of the following is the best conclusion that the student can make regarding the age of the fossils?
1.The fossils are less than 80,000,000 years old. 2.The fossils are still about 80,000,000 years old. 3.The fossils are 80,000,024 years old. 4.The fossils are more than 80,000,000 years old.
According to the principle of equivalence, gravity is equivalent to
A) acceleration. B) the state of free-fall. C) net force. D) energy. E) velocity.
Two mirrors are at right angles to one another. If an object is placed near the mirrors, what is the largest number of images that would be seen in the mirrors?
a. 3 b. 2 c. 4 d. 5 e. 6
A space tow barge pushes on a spaceship with a rest mass of 15,000 kg and accelerates it from a speed of 0.600c to a speed of 0.700c. How much work does the tow barge have to do to accomplish this?
A) 1.35 × 1020 J B) 2.03 × 1020 J C) 2.70 × 1020 J D) 5.42 × 1020 J E) 8.78 × 1019 J