Headward erosion of a group of cirques around a mountain may produce
A) glacial lakes.
B) an arete.
C) a horn.
D) a hanging valley.
Answer: C
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What is the significance of Planck time?
A) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred. B) It is the time at which inflation is thought to have occurred. C) It is the time when the cosmic microwave background was released. D) It is the amount of time required for two protons to fuse to make deuterium.
I left five 100. watt bulbs burning in my basement for two weeks. If electricity costs me 10.ยข/kw-h, how much did the electricity cost (to the nearest dollar) to leave these bulbs on and how many Joules of electrical energy did they consume?
What will be an ideal response?
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours
The change in brightness alternates between a small change and a large change. The most likely explanation is that ________. A) the star is a member of an eclipsing binary star system B) the star is periodically ejecting gas into space, every 73 hours C) the star is a Cepheid variable D) the star is a white dwarf
Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. resistivity B. resistance C. energy D. current E. capacitance