Physics Review QuestionUnit:
mechanicsYear:
1995 Question#:
1Question:
The thickness of a dollar bill is closest to(1
) 10^{-4} m(2
) 10^{-2} m(3
) 10^{-2} m(4
) 10^{1} mWhat is this question really asking?
Explanation by: Christine A [ Return to question menu
]Answer 1
10 ^{-4} mCORRECT This is correct because 10 ^{-4}m is equal to .0001 m, or 0.1 mm. This is approximately the thickness of your ordinary
dollar bill.
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Answer 2
10 ^{-2} mINCORRECT 10 ^{-2}m is equal to one centimeter, or about the thickness of an average thumb. Ordinary
dollar bills are not this thick, so answer 2 must be incorrect.
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Answer 3
10 ^{-1} mINCORRECT This answer is equal to 0.1 meters, or 10 centimeters. This is considerably thicker than a dollar bill- however, it is comparable to a large stack of dollar bills- thus, this answer must be incorrect. return to top
Answer 4
10 ^{1} mINCORRECT Ten to the first power meters is equal to ten meters. Thus, this question states that a dollar bill is ten meters tall. Ten meters is approximately the height of a one-story building. Knowing this, answer 4 is clearly wrong. return to top
What's this question really asking?
(a) Do you know how to use exponents (especially negative ones)? (b) Do you know the approximate length of a meter? (c) Do you know how big a dollar bill is? return to top |

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