As described by Kepler's second law, an object in an elliptical orbit reaches its highest velocity when it is as at ____
a. lowest; perigree
b. highest; apogee
c. highest; perigree
d. lowest; apogee
e. escape velocity; perigree
c
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Which star is older?
A) an M star in the globular cluster M13 B) an A star in the globular cluster M13 C) Both stars (the A and M star) are the same age.
If CP for an ideal gas is 35.4 J/mol/K, which of the following is CV for this gas?
a. 12.5 J/mol/K b. 20.8 J/mol/K c. 29.1 J/mol/K d. 27.1 J/mol/K e. 43.4 J/mol/K
The first solenoid has 2 times the diameter, 2 times the number of turns, and 2 times the length of the second solenoid. Which solenoid has the greater inductance and by what factor?
a. the first solenoid by a factor of 8 c. the first solenoid by a factor of 16 b. the second solenoid by a factor of 8 d. the second solenoid by a factor of 32
As of early 2013, the number of confirmed exoplanets found was:
A) 5, all around stars within 20 light years of us. B) 42, all much bigger than Jupiter, but orbiting red dwarf stars. C) over 400, orbiting more than 300 stars. D) about 900, mainly around stars much smaller and fainter than our Sun. E) thousands, around every star we have closely examined to date.