Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body is now __________ times the original force
Fill in the blank(s) with correct word
1/4
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Two copper wires, one double the diameter of the other, have the same current flowing through them.If the thinner wire has a drift velocity v1, and the thicker wire has a drift velocity v2, how do the drift velocities of the charge carriers compare?
A. v1 = v2 B. v1 = 2 v2 C. 2 v1 = v2 D. v1 = 4 v2 E. 4 v1 = v2
According to current evidence, Pluto is best described as
A) a large member of the Kuiper belt. B) a terrestrial planet that is surprisingly far from the Sun. C) a small jovian planet. D) an escaped moon of Jupiter or Saturn.
The iron we commonly find in our surroundings came from
A) the iron core of a massive star which exploded as a type I supernova. B) planetary nebulae. C) jets ejected by a rapidly spinning pulsar. D) material ejected by a nova explosion. E) decay of nickel 56 and cobalt 56 in a supernova remnant.
A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33
A) 0° B) 68° C) 60° D) 30° E) 22°