Stars are evenly distributed throughout the Universe.
a. true
b. false
b. False
(Gravity pulls stars together to form giant systems called galaxies, which are separated by immense expanses of empty space)
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Comets are largely made out of
A) rock and ice. B) hydrogen gas. C) rock. D) hydrogen compounds. E) metal.
What is one of the alternatives to the hypothesized existence of dark matter?
A) The astronomers are misrepresenting the observations. B) The current theory of gravity is being used incorrectly. C) The observations are incorrect. D) The theory of gravity is wrong.
An astronaut weighs 900 N when measured on the surface of Earth. How large would the force of gravity on him be if he were in an Earth satellite at an altitude equal to Earth's radius?
A. 225 N B. 450 N C. 900 N D. 3600 N
If C = 10 ?F, what is the equivalent capacitance for the combination shown?
A. 7.5 ?F B. 6.5 ?F C. 7.0 ?F D. 5.8 ?F E. 13 ?F