The amount of current in an incandescent bulb rated 75W-120V is about
A) 0.4 A.
B) 0.6 A.
C) 1.2 A.
D) more than 1.2 A.
Answer: B
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Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.13c B) 0.14c C) 0.15c D) 0.16c E) 0.18c
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N
A metric ton (or tonne) is
a. the same as a British ton. b. not defined. c. a mass unit. d. a weight unit.
The longest-daylight day for people in the Northern Hemisphere at latitudes greater than 25°N occurs when the noon Sun is overhead at the
a. Greenwich meridian. b. Tropic of Cancer. c. equator. d. Tropic of Capricorn.