A simple machine cannot multiply
A) force.
B) distance.
C) energy.
D) none of the above
Answer: C
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Suppose that hydrogen, rather than iron, had the lowest mass per nuclear particle. Which of the following would be true?
A) Nuclear fusion could not power stars. B) Stars would be brighter. C) Stars would be less massive. D) All stars would be red giants.
What is the meaning of the solar constant?
A) the regularity of the 11-year sunspot cycle B) the amount of energy the Earth receives per unit area and unit time C) the stability of the Sun's luminosity for as long as life has existed on Earth D) the fact that features on the Sun appear to never change E) the fact that the amount of hydrogen turning into helium in the core is fixed
The majority of dark matter is probably not protons and neutrons
Indicate whether the statement is true or false
In glass, which of the following colors of light travels fastest?
a. red b. blue c. yellow d. All three of the above travel at the same speed.