By what factor is the self-inductance of an air solenoid changed if only its cross-sectional area, A, multiplied by eight?
a. 1/8
b. 8
c. 24
d. 64
e. 1/64
b
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Ideal Gas Law: Originally 2.00 mol of gas are at STP. If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
Fill in the blank(s) with the appropriate word(s).
Why does the Moon show phases in the course of a month?
Clouds get in the way of the Moon's light and cover up parts of it. The Moon glows from the inside and its various continents glow different amounts. The angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight. The Earth's shadow falls on the Moon to different degrees as the Moon goes around.
Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has 9 times times the resistivity of the shorter wire. B) The longer wire has 27 times times the resistivity of the shorter wire. C) The longer wire has 3 times the resistivity of the shorter wire. D) Both wires have the same resistivity.
In the summer in the northern hemisphere,
a. the Earth is closer to the Sun. b. the Earth's northern hemisphere is tilted toward the Sun. c. the Earth's northern hemisphere is tilted away from the Sun.