When a negative charge is released and moves along an electric field line, it moves to a position of
a. lower potential and lower potential energy.
b. lower potential and higher potential energy.
c. higher potential and lower potential energy.
d. higher potential and higher potential energy.
e. decreasing magnitude of the electric field.
C
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Snell's Law: 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. 30° C. 60° D. 22° E. 68°
The brightest planet has an apparent magnitude of about – 4 and is named
a. Jupiter. b. Saturn. c. Mars. d. Venus.
Which one of the following is not true of neutrinos?
a. They have no charge. b. They have no spin. c. One type of neutrino may change into another type of neutrino. d. They are leptons. e. They do not take part in strong nuclear interactions.
A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip?
A) 74 km/h B) 140 km/h C) 70 km/h D) 73 km/h E) 69 km/h