Which of the following best describes the geological histories of the Moon and Mercury?
A) Early in their histories, they suffered many impacts and experienced some volcanism and tectonics, but they now have little geological activity at all.
B) Impact cratering is the only major geological process that has affected their surfaces.
C) All four geological processes were important in their early histories, but only tectonics still reshapes their surfaces today.
D) Impact cratering shaped these worlds early in their histories. Then, during the past few million years, they were reshaped by episodes of volcanism and tectonics.
A) Early in their histories, they suffered many impacts and experienced some volcanism and tectonics, but they now have little geological activity at all.
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Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate gas does not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. None of the other choices are correct.
Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be:
A) younger. B) older. C) further away. D) more obscured by dust. E) less obscured by dust.
Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling
A) 2 × 103 B) 2 × 102 C) 2 × 104 D) 2 × 105 E) 2 x 106
If C = 10 ?F, what is the equivalent capacitance for the combination shown?
a.
7.5 ?F
b.
6.5 ?F
c.
7.0 ?F
d.
5.8 ?F
e.
13 ?F