The slope of a velocity vs. time graph is the
a. distance
b. velocity
c. acceleration
d. none of the above
C
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Power: An instrument is rated at 250 W if it is connected across a 120-V dc power supply.(a) What current does it draw under normal operation?(b) What is its resistance?(c) How many kilowatt-hours does it use in a day if it is left on all the time?
What will be an ideal response?
From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of
A) 1/2 Earth year. B) more than 2 Earth years. C) 1 Earth year. D) 2 Earth years. E) It depends on the planet's mass.
When you flip a switch to turn on a light, the delay before the light turns on is determined by:
a. the number of electron collisions per second in the wire. b. the drift speed of the electrons in the wire. c. the speed of the electric field moving in the wire. d. none of these, since the light comes on instantly.
It would be easier to pull the hemispheres apart
1) when they are at sea level 2) if submerged several meters in water 3) if high above the clouds because 4) external pressure on the hemispheres is lessened. 5) water serves as a lubricant. 6) the atmosphere exerts a pressure of 105 N/m2 on both hemispheres.