Most surface ocean currents are due to
A) melting polar glaciers.
B) river flow into the ocean.
C) winds.
D) density differences in the vertical profile of the ocean.
Answer: C
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To help Kim practice for the Special Olympics, Sally runs beside him for half the required distance. She runs the remaining distance at her regular speed and arrives 90 seconds ahead of Kim. What is the ratio of Sally's regular speed to Kim's speed? Use tKim for Kim's total time.
A.
B.
C.
D.
E.
Wire A and Wire B are each carrying the same current. If the diameter of Wire A is twice that of Wire B, how does the drift velocity vdA in Wire A compare to that in in Wire B?
a. vdA = vdB b. vdA = 2 vdB c. vdA = vdB /2 d. vdA = vdB /4
If the mass of the Earth decreased by a factor of two with no change in radius, your weight would
a. increase by a factor of 4. b. increase by a factor of 2. c. stay the same. d. decrease by a factor of 2. e. decrease by a factor of 4.
The orbits of all the planets of the Solar System are inclined _____ to each other
A) less than 2 degrees B) more than 10 degrees C) less than 8 degrees D) more than 12 degrees