Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2-m-high ladders. The center of mass of the Earth (mE = 5.90 
1024 kg) is then displaced
A. 0 m.
B. 1.84 × 10?23 m.
C. 1.84 × 10?14 m.
D. 1.80 × 10?13 m.
E. 2 m.
Answer: C
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Fill in the blank(s) with correct word
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A. Increase the wavelength of the light used. B. Increase the separation between the slits. C. Immerse the apparatus in water. D. All of these. E. None of these.
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Fill in the blank(s) with the appropriate word(s).
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a. white b. red c. black d. silver