Consider the following statement, and explain whether or not it is sensible: Although all the known stars appear to rise in the east and set in the west, we might someday discover a star that will appear to rise in the west and set in the east
What will be an ideal response?
This statement does not make sense. The stars aren't really rising and setting, they only appear to rise in the east and set in the west because Earth rotates.
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What is the current in the 15-? resistor when ? = 9.0 V?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
e.
0.60 A
Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. If this is true, which of the following could explain it?
A) the apparent lack of plate tectonics on Venus B) the slow rotation of Venus C) the high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle D) the smaller size of Venus, which has allowed it to lose much more internal heat than Earth
The operation of a microwave oven makes use of
A) the polar nature of water molecules. B) flip flopping of polarized molecules. C) an oscillating electric field. D) all of the above E) none of the above
A Carnot engine is operated as a refrigerator, taking in 18. J of heat every second and expelling 20. J into a 23.°C room. What is the temperature inside the refrigerator?
A) 300. K B) 15°C C) -15°C D) -6.6°C E) 3.0°C