Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
A. 2.0 A
B. 1.0 A
C. 3.0 A
D. 9.0 A
E. 1.5 A
Answer: C
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A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation
A. can happen because the extra distance traveled makes up for the smaller force applied. B. cannot happen because a crate that heavy would lift the worker, rather than the worker lifting the crate. C. can happen because there is friction in the pulleys so the work done by the worker will not equal the work done on the crate. D. cannot happen because the work done by the worker is less than the work done on the crate.
An example of a diatomic molecule of a compound is
a. P4. b. NO2. c. N2. d. CO.
A supernova is almost always associated with
a. a very massive star. b. a very young star. c. a star undergoing helium flash. d. a white dwarf in a close binary system. e. a solar-like star that has exhausted its hydrogen and helium.
The "big bang" was an explosion of material that created galaxies flying away from the center of the explosion
a. True b. False Indicate whether the statement is true or false