If you drop a rock from a great height, about how fast will it be falling after 5 seconds, neglecting air resistance?
A) It depends on how heavy it is.
B) It depends on what shape it is.
C) 10 m/s
D) 15 m/s
E) 50 m/s
E
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Which of the following statements about the Sun is an inference from a model, not an observation?
A) The photosphere emits visible light. B) The Sun emits neutrinos. C) The corona is hotter than the photosphere. D) The convection zone is cooler than the radiation zone.
The electric field of a point charge has an inverse ________ behavior
a. r1/2 b. r c. r2 d. r3
What is gravitational lensing?
A. the temporary disappearance of a star as an object passes in front of it B. the use of Earth's gravity to shape lenses during grinding C. the focusing and brightening of starlight by the gravitational field of a foreground object D. the use of small telescopes to enhance the brightness of stars
Ashen light (or earthshine) is
A) sunlight reflected by Earth that illuminates the "dark" portion of the Moon. B) the sunlight that shines on the face of the Moon that we never see. C) the light from the Moon that illuminates Earth's surface at night. D) the light we see at dawn just before the Sun rises. E) the light we see at dusk just after the Sun sets.