How many times does the Moon cross the ecliptic each month?
a. none
b. once
c. twice
d. three times
e. four times
c
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If we represent the Milky Way Galaxy as the size of a grapefruit, the distance to the Andromeda Galaxy would be about
A) 3 cm. B) 3 km. C) 30 m. D) 3 m. E) 300 km.
Which of the following is not one of the three major strategies used to measure the mass of a galaxy cluster?
A) measuring the speeds of galaxies orbiting the cluster's center B) studying x-ray emission from hot gas inside the cluster C) observing how the cluster bends light from galaxies located behind it D) measuring the temperatures of stars in the halos of the galaxies
A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal. (A) What is the efficiency of this engine? (B) How much work does this engine do per cycle?
What will be an ideal response?
The most abundant rocks in Earth's crust are the
a. sulfides. b. oxides. c. carbonates. d. silicates.