21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 2, Problem 11QP
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1. A car starts driving at noon (t = 0) and drives at exactly 50 miles per hour until 4pm (t = 4). (b) Sketch a graph of the car's speed (in miles per hour) vs its time (in hours). Shade in the area below your graph, between t = 0 and t = 4. 1 (c) Explain why this area is equivalent to the answer to the "how far did the car drive?" question.
The tropical year, the time from vernal equinox to the next vernal equinox, is the basis for our calendar. It contains 365.242199 days. Find the number of seconds in three tropical years. 49 31557000
1. Write the answers for the following in scientific notation with three significant digits. a. The earth's circumference, measured through the poles, is exactly 40, 000, 000 m (according to an early standard of the meter). What is the radius of the earth, R? R = m. b. The surface area of the earth is given by A = 4 x R². What is the area A? A = m². c. Using the units conversion 1 inch = 2.54 cm, convert the volume V = 302 in³ into a volume in cubic cm (cm³) and in liters. (1 L = 1000 cm³). Show your steps in below! V = cm³ = L.
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