Ancient astronomers believed that Earth did not move because they saw no parallax
Indicate whether the statement is true or false
True
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A solid disk of radius R rolls down an incline in time T. The center of the disk is removed up to a radius of R/2 . The remaining portion of the disk with its center gone is again rolled down the same incline. The time it takes is:
a. T. b. more than T. c. less than T. d. requires more information than given in the problem to figure out.
The surface of Venus can be observed with:
A) the Mt. Wilson 100" telescope. B) radar observations from Arecibo. C) most amateur telescopes. D) the Hubble Space Telescope. E) All of these have provided detailed observations about the surface of our sister planet.
In expressions like ?v and ?t? ? stands for
a. "change in" b. "triangle" c. a constant of proportionality d. a variable
Why couldn't you stand on the Sun's surface?
A) The Sun has no surface at all...the photosphere is an illusion. B) You could stand on the surface. C) The Sun doesn't have a solid surface. D) The Sun's surface is too highly magnetized for anything to survive there. E) You could stand on it, if a sufficiently protective spacesuit could be designed.