An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his moment of inertia about the axis of rotation?
A) It does not change.
B) It decreases.
C) It increases.
D) It changes, but it is impossible to tell which way.
B
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LR Circuits: A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new circuit represents the time required for the current to decrease to
A. 25% of the original value. B. 37% of the original value. C. 63% of the original value. D. 75% of the original value. E. zero.
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
The increase in strength due to solid-solution strengthening is proportional to the _________ power of the atom fraction of solute atoms.
Fill in the blank(s) with the appropriate word(s).
During the summer months in the Southern Hemisphere, ________.
A. Earth is closer to the Sun B. the Northern Hemisphere experiences winter weather C. the Sun is more directly overhead during this time D. the Sun is in the sky for a longer period of time E. All of these choices are correct.