Cave formation in limestone does not involve
A) mildly acidic groundwater.
B) dissolution of carbonate rocks.
C) land subsidence.
D) a dropping water table.
Answer: C
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A car enters a level, unbanked semi-circular hairpin turn of 100-m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800. If the car maintains a constant speed of 28 m/s, it will
A. attempt to dig into the road surface. B. tend to veer toward the center of the semicircle. C. arrive safely at the end of the semicircle. D. tend to veer toward the outside of the circle. E. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
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What will be an ideal response?
The energy stored in the earth's magnetic field with a strength of 0.5 × 10-4 T in a room 3.0 m by 4.0 m by 2.4 m is
A) 570 mJ. B) 29 mJ C) 10 mJ. D) 100 mJ. E) zero.
A uniform rod is 3.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 27° above the horizontal. What is the angular speed of the rod as it passes through the horizontal position?
a. 3.0 rad/s b. 2.8 rad/s c. 2.1 rad/s d. 2.5 rad/s e. 3.4 rad/s