Lower temperatures can be expected
A) behind a stationary warm front.
B) behind an advancing warm front.
C) ahead of an advancing cold front.
D) behind an advancing cold front.
Answer: D
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A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm. A long wire carries a current of 2.0 A along the axis of the solenoid. What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?
a. 78 ?T b. 55 ?T c. 48 ?T d. 68 ?T e. 2.0 ?T
A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 100, 249 B) 100, 245 C) 96, 245 D) 96, 247 E) 94, 247
The amount of friction that occurs when two blocks slide against each other depends on
A) how much they are pressed together. B) the "stickiness" of atoms on their surfaces. C) the kinds of material being pressed. D) all of the above
To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude. B) buy at a low altitude and sell at a high altitude. C) it makes no difference.