Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular speed?
A)
Child A
B)
Child B
C)
They have the same zero angular speed.
D)
They have the same non-zero angular speed.
E)
There is not enough information given to answer the question.
D
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How much work must be done by frictional forces in slowing a 1000-kg car from 26m/s to rest?
A) 3.41 × 105 J B) 2.73 × 105 J C) 4.09 × 105 J D) 4.77 × 105 J
Which of the following is the most numerous type of main-sequence star?
A) a G star B) an O star C) an A star D) an M star E) an F star
The unit of resistance is called a(n)
a. volt. b. ampere. c. coulomb. d. ohm. e. watt.
Which of the following is evidence that solar activity affects Earth's climate?
A. The dust bowl of the 1930s in the United States coincided with the complete disappearance of sunspots during that time. B. The Maunder Minimum-a period of abnormally low sunspot numbers-coincided with abnormally cold northern winters. C. The Schwab Cycle-a period of abnormally numerous and large sunspots-preceded a 250-year drought in Africa. D. All of these choices are correct.