A particle (charge = 50 mC) moves in a region where the only force on it is an electric force. As the particle moves 25 cm from point A to point B, its kinetic energy increases by 1.5 mJ. Determine the electric potential difference, VB - VA
a. -50 V
b. -40 V
c. -30 V
d. -60 V
e. +15 V
C
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Which of the following best describes the evolutionary track of the most massive stars?
A) vertically left, then straight down B) horizontal right C) horizontal right, then a clockwise loop D) diagonally to lower right, then vertical, then horizontal left E) horizontally right, diagonal to lower left, then horizontal right
The radius of the earth’s (almost circular) orbit around the sun is 150,000,000 km, and it takes 1 y for the earth to go around the sun. Imagine that a certain satellite goes in an almost circular orbit of radius 15,000 km around the earth (this radius is 10,000 times smaller than the earth’s orbital radius around the sun). What is the period of this orbit?
A. 10-6 y B. 10-4 y C. 10-3 y D. 106 y E. These periods are not related in any simple way.
In a two-slit experiment, there are 11 bright fringes within the central diffraction maximum. What is the ratio of the slit width to the slit separation?
A. 5 B. 1/6 C. 1/5 D. 6
General Questions: A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A. down the ramp. B. up the ramp. C. perpendicular to the ramp. D. vertically downward. E. None of these choices is correct.