21st Century Astronomy 6E
6th Edition
ISBN: 9780393690675
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton
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Chapter 4, Problem 9QP
To determine
The change in the strength of lunar tides if Earth had half its current radius.
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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.
Choose all that apply to spring tide
A.
when the Sun,Earth and Moon are aligned,the tides due to the Sun and the Moon coincide.
B.
spring tides happen in Spring season.
C.
Higher than average high tides and lower than average low tides.
D.
when the Sun,Earth and Moon are aligned,the tides due to the Sun and the Moon partly cancel..
1. The reason that there are two daily tides on Earth is that one occurs when the sun is overhead and the other when the Moon is overhead.
True or False
2. Tides are approximately 24 hours apart.
True or False
Chapter 4 Solutions
21st Century Astronomy 6E
Ch. 4.1 - Prob. 4.1ACYUCh. 4.1 - Prob. 4.1BCYUCh. 4.2 - Prob. 4.2CYUCh. 4.3 - Prob. 4.3CYUCh. 4.4 - Prob. 4.4CYUCh. 4 - Prob. 1QPCh. 4 - Prob. 2QPCh. 4 - Prob. 3QPCh. 4 - Prob. 4QPCh. 4 - Prob. 5QP
Ch. 4 - Prob. 6QPCh. 4 - Prob. 7QPCh. 4 - Prob. 8QPCh. 4 - Prob. 9QPCh. 4 - Prob. 10QPCh. 4 - Prob. 11QPCh. 4 - Prob. 12QPCh. 4 - Prob. 13QPCh. 4 - Prob. 14QPCh. 4 - Prob. 15QPCh. 4 - Prob. 16QPCh. 4 - Prob. 17QPCh. 4 - Prob. 18QPCh. 4 - Prob. 19QPCh. 4 - Prob. 20QPCh. 4 - Prob. 21QPCh. 4 - Prob. 22QPCh. 4 - Prob. 23QPCh. 4 - Prob. 24QPCh. 4 - Prob. 25QPCh. 4 - Prob. 26QPCh. 4 - Prob. 27QPCh. 4 - Prob. 28QPCh. 4 - Prob. 29QPCh. 4 - Prob. 30QPCh. 4 - Prob. 31QPCh. 4 - Prob. 32QPCh. 4 - Prob. 33QPCh. 4 - Prob. 34QPCh. 4 - Prob. 35QPCh. 4 - Prob. 36QPCh. 4 - Prob. 37QPCh. 4 - Prob. 38QPCh. 4 - Prob. 39QPCh. 4 - Prob. 40QPCh. 4 - Prob. 41QPCh. 4 - Prob. 42QPCh. 4 - Prob. 43QPCh. 4 - Prob. 44QPCh. 4 - Prob. 45QP
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- A low tide is occurring at Galveston, Texas (29N, 95W). (a) What other longitude is also experiencing a low tide? (b) What two longitudes are experiencing high tides?arrow_forwardDetermine the month and day when the Sun is at maximum altitude for an observer in Washington, D.C. (39N). What is the altitude of the Sun at this time? Answer: on or about June 21, 74.5arrow_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
- 9arrow_forward1. The tides are present on earth because... A) the sun causes the earth to orbit B) the moon has a negligible gravitational effect on the earth except for in the oceans C) there is a different force of gravity acting on either side of the earth resulting from the moon D) tectonic plates shift as the earth rotates causing the water levels to vary.arrow_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
- According to Lunar Laser Ranging experiments the average distance LM from the Earth to the Moon is approximately 3.85 × 10° km. The Moon orbits the Earth and completes one revolution in approximately 27.5 days (a sidereal month). How can the mass of the Earth be calculated using the information above? Select the correct statements. Select one or more: O a. Use Newton's third law. O b. Use Newton's first law. c. Use Coulombs law. O d. Use Newton's second law.arrow_forwardWhich of the following is a measurable effect of the tidal interactions between the Earth and the moon? choose 1 of the following: a. The moon is constantly getting closer to the Earth, and will one day collide with our planet. b. The rotation rate of the Earth is gradually slowing down. c. The rotation rate of the moon is gradually speeding up. d. The moon pulls more strongly on the far side of the Earth than it does on the near side.arrow_forwardWhich statement describes the sun's position relative to planetary orbits? A. The sun is at the center of each planet's circular orbit. B. The sun is midway between the foci of each planet's elliptical orbit. C. The sun is one focus of each planet's elliptical orbit. D. The sun alternates between the two foci of planetary orbits.arrow_forward
- When tidal bulges are NOT in a direct Earth-moon line but slightly ahead of the moon, a. Earth’s gravity weakens. b. their gravitational field pulls the moon forward in its orbit, causing it to recede from Earth. c. their gravitational field pulls the moon back in its orbit, causing the moon to fall toward Earth. d. Earth’s gravity strengthens, causing the moon to orbit faster. e. the tidal bulges have no effect on the moon.arrow_forward7. What is the gravity constant in our planet? a. 10 m/s2 b. 2.3 m/s2 c. 1.0 m/s2 d. 9.8 m/s2arrow_forward8. The mean distance of Earth from the Sun is 149.6 x 10° km and the mean distance of Mercury from the Sun is 57.9 x 10° km. The period of Earth's revolutions is 1 year, what is the period of Mercury's revolution? a. 0.24 year on Earth b. 0.42 year on Earth C. 1.13 year on Earth d. 1.31 year on Earth 9. The planet Delta has 2 times the gravitational field strength and 3 times the radius of Earth. How does the mass of the planet Delta compare with the mass of Earth?arrow_forward
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