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.
Answer: B
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If the coefficient of kinetic friction between the object and the horizontal surface is 0.20, what is the initial speed of the object? Use g = 10 m/s2. A) 9.8 m/s B) 6.0 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s
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a. True b. False Indicate whether the statement is true or false
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