In a diagram of electric field lines, q1 has 9 lines going into it and q2 has 27 lines going out of it. If one of the charges is -40 mC, which of the following could be the other one?
A. -120 mC
B. 18.0 mC
C. -18.0 mC
D. 120 mC
E. none of the these choices are correct
D. 120 mC
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Globular clusters have approximately how many stars?
a. 100,000 – 1,000,000 b. 10,000 – 90,000 c. 5,000 – 10,000 d. 1000 - 5000 e. less than 1000
The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.
If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
a. 2170 Mpc b. 2030 Mpc c. 30 Mpc d. 0.03 Mpc e. 147,000 Mpc
Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field B. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.