Halley's comet has an orbital period of 76 years, what is the average distance of Comet Halley from the sun?
a. 51 AU
b. 18 AU
c. 114 AU
d. 660 AU
e. 38 AU
B
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How tiny a spot is the Hubble Deep Field?
A: About 1/2 of the entire sky. B: About 1/5 of the entire sky. C: About 1/10 of the entire sky. D: About 1/50 of the entire sky. E: The size of President Roosevelt's eye on a dime held at arm's length.
About how old was the universe when the microwave background radiation that Penzias and Wilson discovered first became visible?
a. 1 microsecond (10^-6 second) when the electromagnetic force separated out from the electroweak force. b. 3 minutes, the start of the period that ended with typical photons unable to produce electron-positron pairs. c. 300 thousand years, when matter in the universe became transparent to photons. d. 1 million years, when the strong force separated out. e. 30 million years, when the strong force separated out.
Which part of the Sun is covered with granules?
A. chromosphere B. corona C. photosphere D. core
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. (a) Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline
(b) Determine the angular speed of the sphere about its center at the bottom of the incline. (c) Through what angle (in radians) does this sphere turn as it rolls down the incline? (d) Does the linear speed in (a) depend on the radius or mass of the sphere? Does the angular speed in (b) depend on the radius or mass of the sphere?