What is the Hubble constant essentially a measure of?
a. the number of galaxies in the universe
b. the expansion of the universe
c. the age of the Milky Way galaxy
d. the amount of dark matter in an average galaxy
b
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What is the escape velocity from the Moon for a lunar landing module sitting on the Moon's surface? Hints: ; The mass of the Moon is 7.2 × 10^22 kg; its radius is 1738 km; G = 6.67 10^-11 m3/s2/kg
a. 2.3 m/s b. 23 m/s c. 2.3 km/s d. 11 km/s e. 23 km/s
Parallax is the shift in a star's apparent position due to Earth's motion around the Sun.
Answer the following statement true (T) or false (F)
Twenty-five identical molecules are in a box. Microstates are designated by identifying the molecules in the left and right halves of the box. The multiplicity of the configuration with 15 molecules in the right half and 10 molecules in the left half is:
A. 1.03 × 1023 B. 3.27 × 106 C. 150 D. 25 E. 5
The principal difference between a step-up and step-down transformer is
A) step-up transformers can handle more current. B) different geometries. C) different ratios of turns for each set of loops or coils. D) none of the above