Hold a pencil in front of your eye at a position where its blunt end just blocks out the Moon (Fig. 1–19). Make appropriate measurements to estimate the diameter of the Moon, given that the Earth-Moon distance is 3.8 × 10° km. FIGURE 1-19 Problem 48. How big is the Moon?

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A: r = (6.50 ± 0.20) cm mass M = (1.85 ± 0.02) kg.

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Q: what is the result of (4.00 m x 1.70 m)/0.60 m with proper number of significant figures?

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Q: Given that there are 2.54 cm in one inch, how many inches are in 100 meters?

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Q: What is the result of 2.56 ÷ 3.793 written with the correct number of significant figures?

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Q: If y equals to 9 minus 7x plus 2x squared, find y when x equals to 3?

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Q: 250km2 to ft?

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Q: What is the area, and its approximate uncertainty, of a circle of radius 3.1 × 104 cm?

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