Resistance and Resistivity: How much current will be flowing through a 57.0-m length of copper wire with radius 5.7 mm if it is connected to a source supplying 62.0 V? The resistivity of the metal is 1.68 × 10-8 ? ? m.
A. 6600 A
B. 37 × 108 A
C. 190 nA
D. 3900 A
Answer: A
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How long can a four-solar-mass star live?
a. 1 solar lifetime b. 0.03125 solar lifetimes c. 3 solar lifetimes d. None of the other choices are correct.
An "onion skin" shell burning structure develops in:
A. a star much less massive than the Sun. B. a white dwarf. C. a star like the Sun. D. a neutron star. E. a star much more massive than the Sun.
A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool). If some of the cargo is thrown overboard, the level of water in the lock will
A) rise. B) drop. C) stay the same. D) rise, provided it is lumber that is thrown overboard. E) rise, provided it is iron ore that is thrown overboard.
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ