The most common rocks in Earth's crust are
a. sedimentary.
b. metamorphic.
c. igneous.
d. lava.
c
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At the Earth’s orbital distance, the intensity of the solar radiation is approximately 1400 
What is the value for the rms Electric field strength in solar radiation?
A. 726 V/m B. 363 kV/m C. 527 kV/m D. 513 kV/m
Monkey Mo hangs from the middle of a horizontal rope. Tension in the rope is greatest if the rope
A) sags a lot. B) sags very little. C) sags or doesn't sag, for tension is the same in any case. D) none of the above
The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
A) half as far. B) 1.5 times as far. C) twice as far. D) 4 times as far. E) the same.
A 12.0-kg mass is placed on a 29.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.660, and the coefficient of sliding friction is 0.546 . The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?
a. 57.0 N b. 102.9 N c. 56.2 N d. 67.9 N e. 10.5 N