The amount of radiation left over when all incoming and outgoing flows have been tallied is called __________.
What will be an ideal response?
net radiation
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If the distance from Earth to the Moon were doubled, the gravitational force between them would increase by a factor of 22, or 4
Indicate whether the statement is true or false
How does the study of quasars reveal information of the history of the universe?
a. Typical quasars are very distant so we can view how galaxy evolution occurred in the past. b. Quasars contain stars of all ages. c. Quasars typically act as host galaxies for gravitational lensing. d. Quasars generate their energy in very small volumes of space
A disk and a sphere are released simultaneously at the top of an inclined plane. They roll down without slipping. Which will reach the bottom first?
A) The one of smallest diameter. B) The one of greatest mass. C) The disk. D) The sphere. E) They will reach the bottom at the same time.
The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7