Which of the following is an example in which you are traveling at constant speed but not at constant velocity?
A) rolling freely down a hill in a cart, traveling in a straight line
B) driving backward at exactly 50 km/hr
C) driving around in a circle at exactly 100 km/hr
D) jumping up and down, with a period of exactly 60 hops per minute
E) none of the above
C
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A solid nonconducting sphere of radius R carries a uniform charge density throughout its volume. At a radial distance r1 = R/4 from the center, the electric field has a magnitude E0. What is the magnitude of the electric field at a radial distance r2 = 2R?
A) E0/4 B) zero C) E0/2 D) E0 E) 2E0
Satellite Motion: A satellite having orbital speed V orbits a planet of mass M. If the planet had half as much mass, the orbital speed of the satellite at the same distance from the center would be
A. V
.
B. 2V.
C. V.
D. V/
.
E. V/2.
What evidence do we have that the halo population of stars are older than other stars in the galaxy?
A) They are farther away. B) They have higher masses than other stars in the galaxy. C) They have fewer planets. D) They have a smaller proportion of heavy elements. E) They move slower than other stars in the galaxy.
An object that is giving off only infrared electromagnetic waves is giving off heat through:
a. convection. b. conduction. c. radiation. d. visible light.