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# hw1 - Homework#1(1(2 2 = 4 points total PF p 20 Q2 2 The...

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Homework #1 (1) (2 + 2 = 4 points total) PF, p. 20, Q2 2. “The speed of light is 3 x 10 5 km/sec. Express this number in m/sec and in cm/sec.” (2) (4 points) PF, p. 20, Q3 3. “Geologists study different strata to determine conditions on Earth long in the past. For example, dinosaur bones are found in strata dating from about 245 million to 65 million years ago. How is it that astronomers are able to see parts of the Universe appearing as they were in the past?” (3) (6 points total) Let’s practice using scientific notation. (a) (2 points) Write 45097.11 in scientific notation and 6604, with only one digit to the left of the decimal point. (b) (2 points) Write 0.002678 and 0.0556 in scientific notation, with only one digit to the left of the decimal point. (c) (2 points) Write 6.68 x 10 -6 and 5.31 x 10 4 as an ordinary string of digits (i.e., not scientific notation). (4) (3 points each part; 15 points total.) PF, p. 20, Q7 7. “Suppose you wish to construct a scale model of the Solar System. The distance between the Earth and the Sun (one “Astronomical Unit”--1 A.U.) is 1.5

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