What are the clouds of Venus mainly composed of?
A. carbon dioxide
B. sulfuric acid droplets
C. methane
D. water vapor
Answer: B
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In M82, observations indicate that there are several bright sources close to the center of the galaxy. These might be
A) supernovae. B) accretion disks of supermassive black holes, millions of times as massive as our sun. C) accretion disks of intermediate black holes, hundreds of times as massive as our sun. D) accretion disks of stellar mass black holes. E) red giants in the process of forming planetary nebulae.
If the Space Shuttle were given a much larger fuel tank, it could achieve speeds of about 90 percent of the speed of light
Indicate whether the statement is true or false
Standing Waves on a String: One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
A. 26.1 Hz B. 8.7 Hz C. 4.35 Hz D. 30.4 Hz E. 17.4 Hz
A mega-parsec is equivalent to
a. 3.26 light-years. b. 206,265 AU c. the age of our solar system d. a million parsecs. e. the diameter of the Milky Way galaxy.