21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 4, Problem 8QP
To determine
The change in the strength of lunar tides if the Moon were twice as massive.
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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.
1. 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.
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..
Chapter 4 Solutions
21st Century Astronomy
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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- Due to tidal forces, a moon orbiting a planet will eventually a always keep the same side toward the planet b collide with the planet c break up into a number of fragments d develop a warmer climate as time goes on Jupiter's moon Io is very volcanically active, which means it has plate tectonics. a. true b. falsearrow_forwardWhen 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_forward2. Show that the divergence of the geostrophic wind is – v,(cot $)/a if the variations in fwith latitude are accounted for (i.e., use the full definition of the Coriolis parameter f = 2.0 sin p). To derive this relationship, recall that on a spherical planet, the distance north is y = aø, where ø is latitude (in radians) and a is the radius of Earth (6,370,000 m). Thus, a derivative in y can be expressed as a derivative in latitude o via the following relationship: a 1 a ду а дфarrow_forward
- Which 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_forwardThe rotation of the planets around the sun is governed by: A. The gravitational field of the sun. B. The gravity of the stars. C. The heat energy of the sun. D. The gravity of the other planets of the solar system. Kelper's second law relates between them: O A. The time period of rotation of the orbiting planet around the sun and the average distance of the planet to the sun. OB. The time period of rotation of the orbiting planet around the sun and the average distance of the planet to the earth. C. The time period of rotation of the orbiting planet around the sun and the average distance of the planet to the moon. OD. The time period of rotation of the orbiting planet around the earth and the average distance of the planet to the sun.arrow_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_forward
- 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 Falsearrow_forward2. During a sunrise, the Sun appears to "rise up" from the horizon. Why does this happen? A. Earth is spinning on its axis. B. The Sun is circling around Earth C. The Sun is moving closer to Earth. D. Earth is revolving around the Sun. Explanation: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
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