Which of the following can cause mutations in living organisms?
A) natural selection
B) a changing climate
C) reproduction
D) ultraviolet light and toxic chemicals
E) the greenhouse effect
D) ultraviolet light and toxic chemicals
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An AC voltage source, with a peak output of 120 V, results in dissipation of energy in a resistor at rate of 50.0 W. What is the value of the resistance?
a. 100 W c. 144 W b. 120 W d. 72.0 W
It was the distribution of ________ that showed Harlow Shapley we were nowhere near the center of the Milky Way early in the 20th century
A) planetary nebulae B) emission nebulae C) open clusters D) globular clusters E) supernova remnants
What would describe the earliest galaxies?
A) They were free of dark matter. B) They were mostly elliptical galaxies. C) They were mostly spiral galaxies. D) They were undergoing rapid changes. E) They were fully-formed,no longer evolving.
The surface gravity of Jupiter is only 2.5 times larger than Earth's, despite the fact that Jupiter's mass is more than 300 times that of Earth. How can this be?
A. Jupiter has no surface, so it does not have a surface gravity. B. The radius of Jupiter is much larger than Earth's, so a point in the cloud tops of Jupiter is farther from its center. C. Jupiter is mostly hydrogen and helium, while Earth is mostly iron and rock. D. The radius of Earth is 300 times smaller than the radius of Jupiter.