A long wire carries a current toward the north in a magnetic field that is directed vertically downward. What is the direction of the magnetic force on the wire?
a) west
b) north
c) east
d) vertically upward
e) vertically downward
Ans: a) west
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Resolution: A certain astronomical telescope has a diameter of 5.60 m. What is the minimum angle of resolution for this telescope when it is forming images using light of wavelength 620 nm?
A. 1.11 × 10-7 rad B. 3.11 × 10-7 rad C. 2.70 × 10-7 rad D. 1.35 × 10-7 rad E. 4.05 × 10-7 rad
The famed meteorite with carbonate rocks and possible microfossils came from:
A) Venus. B) the Moon. C) Mars. D) Europa. E) Comet Halley.
A 10th magnitude star is ________ than a 5th magnitude star.
A. 2 times fainter B. 100 times fainter C. 2 times brighter D. 100 times brighter
The halo in the Milky Way is a part of the _____ of the galaxy
A) disk component B) spherical component C) central bulge D) spiral arms