The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms.
B) 44 ohms.
C) 220 ohms.
D) 440 ohms.
E) none of the above
Answer: C
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The SI unit of pressure is the pascal
a. True b. False Indicate whether the statement is true or false
A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track
At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to the spectators watching in the stands, what happens? (Assume they could somehow watch a slow-motion replay to see what occurred.) A) The light beam wins the race, but barely—it is going 1% of the speed of light faster than him. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam wins the race by a large margin because it is going faster than him by the full speed of light. D) Ben beats the light beam to the finish line, becoming a hero.
A parallel plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. It takes a force 1.20 N applied to the plate to sustain this speed. What is the viscosity of the oil?
A) 6.00 kg/(m?s) B) 20.0 kg/(m?s) C) 60.0 kg/(m?s) D) 0.200 kg/(m?s) E) 200 kg/(m?s)
What is "excluded" by the Pauli exclusion principle?
a. certain values of angular momentum b. precise values of both position and momentum c. electrons in the same quantum state d. none of the above