Which of the following best described the major ingredients of the jovian planets?
A) rocky minerals and water
B) hydrogen, helium, and hydrogen compounds
C) rock and metal
D) hydrogen compounds and carbon dioxide
E) hydrogen and helium only
B) hydrogen, helium, and hydrogen compounds
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Aerobic organisms first started building up oxygen in the Earth's atmosphere around
A) 4.6 billion years ago B) 3.5 billion years ago C) 4.0 billion years ago D) 2.5 billion years ago
A star is 10 parsecs from Earth. Which statement is true?
A) The star's apparent magnitude is larger than its absolute magnitude. B) The star is about 33 ly away. C) The star's parallax is 1.0 arc seconds. D) The star's apparent magnitude is smaller than its absolute magnitude. E) The star is in a different galaxy.
A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is
A. 2.5 m/s2. B. -2.5 m/s2. C. 10 m/s2. D. 0 m/s2. E. -10 m/s2.
________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles
a. An emission nebula b. Hydrostatic equilibrium c. The proton-proton chain d. The thermonuclear fusion of hydrogen e. A bipolar outflow