The electric power of a lamp that carries 2 A at 120 V is
A) 1/6 W.
B) 2 W.
C) 60 W.
D) 20 W.
E) 240 W.
Answer: E
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When you remove electrons from a metal cup, the cup becomes
A) negatively charged. B) positively charged. C) ionized.
What atomic interactions create resistance?
a. Electrons losing charge to protons along the wire. b. Electrons slowing down as they bump into other atoms. c. Electrons being trapped by other atoms and ceasing to travel the current pathway. d. Electrons being acted upon by the electric field from the battery. e. Electrons moving faster as they get closer to the positive terminal.
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
Mass and Weight: An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?
A. 16 N B. 61 N C. 99 N D. 600 N E. 440 N