Which type of heating causes sunburn?
a. conduction
c. radiation
b. convection
d. all of the above
C
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The shape and size of a nucleus can best be described as
As a 3.0-kg bucket is being lowered into a 14-m-deep well, starting from the top, the tension in the rope is 9.0 N. The acceleration of the bucket will be:
a. 6.8 m/s2 downward. b. 9 m/s2 downward. c. zero. d. 3.0 m/s2 upward. e. 6.8 m/s2 upward.
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
a. 1 200 b. 1 900 c. 800 d. 560 e. 240
Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that signify active star formation. B) They are moving slower than stars in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black.