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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The thermal efficiency of a heat engine is given by
A.
.B.
.C.
.D.
E.
Energy and Momentum: A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east. The two vehicles stick together and slide along the road after colliding. A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m, at an angle of 50° south of east, from the point of impact. She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40. What was the speed of the car just before the collision?
A. 20 m/s B. 4.8 m/s C. 14 m/s D. 23 m/s E. 17 m/s
Why is it surprising that spiral arms are stable structures, lasting billions of years? a. Differential rotation should tear the arms apart
b. Gas and dust clouds should run out of material to make young stars. c. Supernova explosions should disrupt the arms. d. Globular clusters are continuously passing through the arms. e. Gravity should pull the arms down into the center of the galaxy.
Which one of the following IS a characteristic of Jovian planets?
a. low average density b. orbits inside the asteroids c. craters in old surfaces d. small diameters e. very few satellites