The apparent weight of a fish in an elevator is greatest when the elevator
A. moves downward at constant velocity.
B. moves upward at constant velocity.
C. accelerates downward.
D. accelerates upward.
E. is not moving.
Answer: D
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High-voltage wires in power lines are not high-current wires because the current in them is
A) not the same as the current that powers the distant load. B) proportional to the voltage drop from beginning to end of each line, rather low. C) both of these D) neither of these
A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3
A) 24 N B) 40 N C) 20 N D) 2.5 N E) 34 N
Given that 1.00 in. = 2.54 cm, how many square centimeters are in 1.00 square inch?
A) 1.59 B) 2.54 C) 5.08 D) 6.45
The rectangular coordinates of a point are (5.00, y) and the polar coordinates of this point are (r, 67.4°). What is the value of the polar coordinate r in this case?
a. 1.92 b. 4.62 c. 12.0 d. 13.0 e. More information is needed.