Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential at a given point in the field is 80 V, what is the potential at a point 1.0 m directly east of the point?
A) 30 V B) 90 V C) 15 V D) 130 V
A
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When we look at an object that is 1,000 light-years away we see it
A) as it was 1,000 years ago. B) as it was 1,000 light-years ago. C) as it is right now, but it appears 1,000 times dimmer. D) looking just the same as our ancestors would have seen it 1,000 years ago.
Instead of thymine, RNA uses the nucleotide base
A) guanine B) uracil C) adenine D) cytosine
A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
a. 7.2 N b. 3.9 N c. 1.5 N d. 14 N e. 8.1 N
It is believed that ring galaxies form
a. when two galaxies collide nearly head on at high speed. b. when two spiral galaxies collide, but not directly head on. c. from a large cloud of gas and dust with very little angular momentum. d. from a large cloud of gas and dust with a very high angular momentum. e. when more than two galaxies collide at the same time.