21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 2, Problem 11QP
To determine
Which is correct answer.
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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.
Chapter 2 Solutions
21st Century Astronomy
Ch. 2.1 - Prob. 2.1ACYUCh. 2.1 - Prob. 2.1BCYUCh. 2.2 - Prob. 2.2CYUCh. 2.3 - Prob. 2.3CYUCh. 2.4 - Prob. 2.4CYUCh. 2.5 - Prob. 2.5CYUCh. 2 - Prob. 1QPCh. 2 - Prob. 2QPCh. 2 - Prob. 3QPCh. 2 - Prob. 4QP
Ch. 2 - Prob. 5QPCh. 2 - Prob. 6QPCh. 2 - Prob. 7QPCh. 2 - Prob. 8QPCh. 2 - Prob. 9QPCh. 2 - Prob. 10QPCh. 2 - Prob. 11QPCh. 2 - Prob. 12QPCh. 2 - Prob. 13QPCh. 2 - Prob. 14QPCh. 2 - Prob. 15QPCh. 2 - Prob. 16QPCh. 2 - Prob. 17QPCh. 2 - Prob. 18QPCh. 2 - Prob. 19QPCh. 2 - Prob. 20QPCh. 2 - Prob. 21QPCh. 2 - Prob. 22QPCh. 2 - Prob. 23QPCh. 2 - Prob. 24QPCh. 2 - Prob. 25QPCh. 2 - Prob. 26QPCh. 2 - Prob. 27QPCh. 2 - Prob. 28QPCh. 2 - Prob. 29QPCh. 2 - Prob. 30QPCh. 2 - Prob. 31QPCh. 2 - Prob. 33QPCh. 2 - Prob. 34QPCh. 2 - Prob. 35QPCh. 2 - Prob. 36QPCh. 2 - Prob. 37QPCh. 2 - Prob. 38QPCh. 2 - Prob. 39QPCh. 2 - Prob. 40QPCh. 2 - Prob. 41QPCh. 2 - Prob. 42QPCh. 2 - Prob. 43QPCh. 2 - Prob. 44QPCh. 2 - Prob. 45QP
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- 9. Using the powers of 10 notation and conversion factors, calculate the number of seconds in the average lifetime (70 years) of a human. 10. Using the powers of 10 notation and conversion factors, calculate the number of seconds you have lived.arrow_forwardThe graph shows a city's daily rate of use of electricity (in millions of kilowatts). Estimate the total daily usage of electricity by summing the area of rectangles. Use the left endpoints, then the right endpoints, then give the average of those results as the answer. Let the width of each rectangle be 2 hours. 14 12- 10- 8- 6- 4- 2- Midnight 4 AM. 8A.M. Noon 4 PM. 8 P.M. Midnight The estimate of the city's total daily usage of electricity for the given day, found by averaging the estimates using left and right endpoints, is million kw-hrs. (Round to the nearest whole number as needed.) Millions ofkilowatt hoursarrow_forwardThe tropical year, the time interval from one vernal equinox to the next vernal equinox, is the basis for our calendar. It contains 365.242 199 days. Find the number of seconds in a tropical year.arrow_forward
- What are the minimum and maximum values for latitude and longitude?arrow_forwardHow is the origin defined in a Cartesian coordinate system?arrow_forward8. Write 0.000083212 in scientific notation using 4 significant figures. 9. Write 985210000 in scientific notation using 3 significant figures. 10. Write the correct form of 5.2298 + 0.5.arrow_forward
- Choose the correct answer. Mean Sea Level is: O a. only used for measuring elevation, not altitude. O b. the reference point for measuring elevation and altitude. O c. used to calculate horizontal distances between points. O d. irrelevant for measuring elevation or altitude. Choose the incorrect answer. The main advantages of a digital level: O a. Inconsistent precision. O b. Automatic data storage. OC. Correction of collimation error. Od. Earth curvature correction. x ENG 8:06 AM 6/21/2023 ^arrow_forward5. What number represents the phrase, “the opposite of the additive inverse of −5?” Part 2: Draw a number line and use it to represent the expression below. Write the value of the expression on the line. 4 + (-5)arrow_forward6. Express the number in decimal: 1.52 x 10^-2 0.00152 0.152 0.0152 0.000152 7. Express the number in decimal 7.78 x 10^-8 0.0000000778 0.000000778 0.00000000778 0.00000778arrow_forward
- 10. How many seconds are in 1.5 years? 11. Chicago uses 1.2 x 10^9 gallons of water per day. How many gallons per second must be pumped from the lake to supply the city? 12. Sixty miles per hour is how many feet per second?arrow_forwardThe farad is not equivalent to which of the following combination of units? а. J/V? а. O b. C/V Ос. d. C V2arrow_forward17. Which of the following represents a standard scientific notation? 12000. 123.0x103 1.230x103 0.230x103 none of the above 18. Which of the following values has 3 significant figures? 120 120x103 12.0x103 1.2x103 none of the abovearrow_forward
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