The positron
a. is an antielectron
b. was the first antimatter particle discovered
c. is the same as a proton
d. all of the above
A, B
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Exhibit 13-1
Two blocks of masses m1 and m2 are connected by a light cord that passes over a pulley of mass M, as shown. Block m2 slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 13-1. The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is
A. proportional to the radius of the pulley. B. proportional to the speed of the blocks. C. proportional to the length of the string. D. to all of the above. E. only to (a) and (b) above.
A 1.50-H inductor is connected in series with a 200-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the energy stored by the inductor 20.0 ms after the switch is closed?
A) 0.910 mJ B) 1.83 mJ C) 3.65 mJ D) 7.31 mJ E) 5.48 mJ
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is __________
Fill in the blank(s) with correct word
Which of the following radiations has the smallest frequency?
a. Infrared b. Visible c. Ultraviolet d. X-rays