21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 2.2, Problem 2.2CYU
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Which is correct answer.
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2. Give two reasons why it is warmer in summer than in winter. Explain how these two
effects cause earth’s seasons.
12 Which of these statements is false?
A Seasons are caused by variations in Earth's distance from the sun
Seasons are opposite in the Northern and Southern Hemispheres
The earth's slightly varying orbital distance has virtually no effect on the weather
B
C
D
E
The real cause of the seasons is the earth's axis tilt
The two hemispheres of the earth take turns being tipped towards the sun over the course of each year
Each year, the radius of the moon’s orbit increases by about 3.8 cm. How does this change affect the length of a month?A. A month gets longer.B. A month gets shorter.C. The length of a month stays the same.
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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- 8. Describe how the seasons would be different if the Earth's axis of rotation, rather than having its present 23.5° tilt, were tilted by: a) 0° b) 90°.arrow_forwardMonthly average wind speed values and standard deviations are given below for 30 m height. a. Calculate the average wind speeds for summer, autumn, winter and spring. b. By using the Empirical Method, calculate the Shape factor, k and Scale factor, c in the Weibull distribution for each season. c. Calculate the Wind Power Density for winter. d. Calculate the Wind Energy Density for winter. Month Average wind speed at 30 m, m/sec Standard deviation, 6 June 2012 3.6200 1.88 July 2012 3.8133 1.98 August 2012 3.7700 1.96 September 2012 2.7055 1.40 October 2012 2.4668 1.28 November 2012 2.3668 1.23 December 2012 3.5441 1.84 January 2013 3.8812 2.02 February 2013 3.5094 1.83 March 2013 4.1341 2.15 April 2013 3.3659 1.75 May 2013 2.7908 1.45arrow_forward1. Calculate the zenith angle at solar noon at a latitude of 40° N on January 19.arrow_forward
- 6 Jupiter's polar temperatures are similar to its equatorial temperatures mainly because of two reasons. What are these reasons? A Because Jupiter has no appreciable axis tilt and because Jupiter has a warm interior. Because Jupiter is fairly round, has no appreciable axis tilt, and has a warm interior. C Because Jupiter is fairly round and because Jupiter has a warm interior. (D) None of the mentioned choices is correct. E Because Jupiter has no appreciable axis tilt and because Jupiter is fairly round in shape. Barrow_forwardWhy is a sidereal day shorter than a solar day? O A. precession of Earth's axis B. the non-circular orbit of Earth around the Sun C. the tilt of Earth's axis D. the combined effect of the rotation of Earth and its orbit about the Sun E. Earth year being a non-integer number of Earth daysarrow_forwardThe friction created when tidal forces move ocean waters over the seabeds a. causes the lunar phases. b. slows the rotation of Earth, gradually making the days longer c. forces the moon to approach Earth. d. has no effect on Earth. e. has no effect on the moon.arrow_forward
- 16. On a summer day at the equator on Mars, the temperature never rises higher than 50.0 degrees Celsius. Find the temperature in degrees Fahrenheit. * a. 102 degrees Fahrenheit b. 115 degrees Fahrenheit c. 129 degrees Fahrenheit d. 135 degrees Fahrenheit e. None of the abovearrow_forwardThat the moon has no magnetic field implies that a. the moon is spinning too slowly to produce a magnetic field. b. the interior of the moon is too hot to produce a magnetic field. c. the crust of the moon is so thick that the magnetic field can not get out of the interior. d. the moon’s core contains little if any molten iron. e. the moon is moving further from Earth.arrow_forwardOn a given day,tides rise and fall at A. the same time everywhere B. the same distance everywhere C. different times and different distances almost everywhere D. the same time and same distance everywherearrow_forward
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