The tilt of Earth's axis greatly affects the
A) change of Earth's seasons.
B) hours of daylight.
C) intensity of sunlight that reaches Earth's surface.
D) distribution of heat energy, hours of daylight, and the change in seasons.
Answer: D
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The approximate main-sequence lifetime of a star of spectral type O is ________
A) 300 million years B) 10 billion years C) 10,000 years D) 3 million years
A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 9.00 s. What distance will the sports car travel during the 9.00 s acceleration period?
A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. The density of the rock is
A) the density of water. B) 1.5 times the density of water. C) 2.5 times the density of water. D) 3.5 times the density of water. E) none of the above
In a certain chemical reaction, 8.1 × 10-19 J of energy is released per molecule formed
What is the difference in mass per molecule between the sum of the masses of the molecules of the reagents before the reaction and the mass of the molecules produced by the reaction? (c = 3.0 × 108 m/s) A) 2.7 × 10-27 kg B) 8.1 × 10-28 kg C) 9.0 × 10-36 kg D) 5.4 × 10-32 kg E) 3.2 × 10-27 kg