A rock that is readily attacked by chemical weathering is
A) limestone.
B) granite.
C) basalt.
D) gneiss.
Answer: A
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A skier leaves a ski jump with a horizontal velocity of 29.4 m/s. The instant before she lands three seconds later, the magnitudes of the horizontal and vertical components of her velocity are:
a. 0; 29.4 m/s. b. 29.4 m/s; 0. c. 29.4 m/s; 29.4 m/s. d. 29.4 m/s; 41.6 m/s. e. 41.6 m/s; 41.6 m/s.
The magnetic field going through a stationary circular loop increases from zero to 5 T in a certain time t. The induced current in the loop will depend on the radius of the loop, r, the resistance of the loop, R, and the time, t. If two of these stay constant, the induced current can be directly proportional to:
a. r. c. R. b. t. d. none of these
EMF's from electrical lines ________
a. drop off with the distance squared from the line b. are only an influence for high voltages c. have been positively shown to cause cancer in children d. are not important inside houses.
Free _________grades of copper have 1 to 6 weight percent lead.
Fill in the blank(s) with the appropriate word(s).