An electron situated near another electron would feel
A. a repulsive magnetic force.
B. an attractive electrical force.
C. a repulsive electrical force.
D. an attractive magnetic force.
E. no forces from the other electron.
Answer: C
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The extinction of starlight due to the interstellar medium I. is the greatest in the ultraviolet. II. is the greatest in the infrared. III. is caused by ionized hydrogen. IV. is caused by dust particles
a. I & III b. II & III c. I & IV d. II & IV e. only IV
You can see your image in a mirror because of diffuse reflection
a. True b. False Indicate whether the statement is true or false
A hill is 150 m long and makes an angle of 12° with the horizontal. As a 60-kg jogger runs up the hill, how much work does gravity do on the jogger?
a. 8.82E+4 J b. 1.83E+4 J c. ?1.83E+4 J d. 8.63E+4 J e. zero
____________________ galaxies have a definite disk component, but contain no evidence of spiral pattern, few hot young stars, and little gas and dust
Fill in the blank(s) with correct word