21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780393415216
Author: Kay
Publisher: NORTON
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GMm
F,
r2
F(r = R)
The surface gravity g
of a body is. The acceleration due to gravity that an object
m
would feel on the surface of the body.
A. Show that the surface gravity of Earth is ge = 9.8 m/s².
B. Determine the surface gravity of the Sun.
C. Determine the surface gravity of the Sun when it becomes a red giant star, assuming
RG 1 AU. Use this answer to explain the significant mass loss rates observed in
these objects.
The first planets found in a pulsar system were found to have a mass of about
a.
1 Earth mass.
b.
3–4 Earth masses.
c.
20 Earth masses.
d.
100 Earth masses.
e.
zero, because planets have not been found around pulsars.
19 A planet is detected via the Doppler technique. The velocity change of the star is a measure of
A The planet's size and density.
B
C
D
E
The planet's mass and orbital distance.
The planet's orbital period and eccentricity.
The planet's mass and composition.
The planet's size and orbital distance.
Chapter 13 Solutions
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
Ch. 13.1 - Prob. 13.1CYUCh. 13.2 - Prob. 13.2CYUCh. 13.3 - Prob. 13.3CYUCh. 13.4 - Prob. 13.4CYUCh. 13 - Prob. 1QPCh. 13 - Prob. 2QPCh. 13 - Prob. 3QPCh. 13 - Prob. 4QPCh. 13 - Prob. 5QPCh. 13 - Prob. 6QP
Ch. 13 - Prob. 7QPCh. 13 - Prob. 8QPCh. 13 - Prob. 9QPCh. 13 - Prob. 10QPCh. 13 - Prob. 11QPCh. 13 - Prob. 12QPCh. 13 - Prob. 13QPCh. 13 - Prob. 14QPCh. 13 - Prob. 15QPCh. 13 - Prob. 16QPCh. 13 - Prob. 17QPCh. 13 - Prob. 18QPCh. 13 - Prob. 19QPCh. 13 - Prob. 20QPCh. 13 - Prob. 21QPCh. 13 - Prob. 22QPCh. 13 - Prob. 23QPCh. 13 - Prob. 24QPCh. 13 - Prob. 25QPCh. 13 - Prob. 26QPCh. 13 - Prob. 27QPCh. 13 - Prob. 28QPCh. 13 - Prob. 29QPCh. 13 - Prob. 30QPCh. 13 - Prob. 31QPCh. 13 - Prob. 32QPCh. 13 - Prob. 33QPCh. 13 - Prob. 34QPCh. 13 - Prob. 35QPCh. 13 - Prob. 36QPCh. 13 - Prob. 37QPCh. 13 - Prob. 38QPCh. 13 - Prob. 39QPCh. 13 - Prob. 40QPCh. 13 - Prob. 41QPCh. 13 - Prob. 42QPCh. 13 - Prob. 43QPCh. 13 - Prob. 44QPCh. 13 - Prob. 45QP
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- 5. We observe an increase in brightness of a star that is 5.81×10¹⁹ m away. How long ago did the actual increase in brightness take place, in years? Find the time that is required for light to reach the Earth.arrow_forwardPlanets around stars other than the sun have recently been discovered by: * A. The variation in the Doppler shift in the star's spectrum. B. The astrometric motion of the stars on the sky. C. Direct imaging D. It is impossible to detect planets around other starsarrow_forwardA helium flash a. is sudden and powerful. b. destroys the star. c. is a slow expulsion of helium gas. d. occurs in very low mass stars.arrow_forward
- The Schwarzschild radius of our sun is a. 3 km. b. 6 km. c. 9 km. d. 30 km.arrow_forwardBecause of the precession of the Earth’s axis, a. there are four seasons, spring, summer, fall, and winter. b. the Earth receives more solar radiation in the summer than in the winter. c. Polaris will not be the North Star in about 12,000 years. d. the lengths of the Earth’s days and nights vary throughout the year.arrow_forward2. What must be the radius of a star of mass 2.0x10" kg so that the escape speed from this star is equal to 2x 10" m/s?arrow_forward
- QUESTION 1 Estimate The Temperature For A Planet In Other Solar System (Questions 1-3) Let us assume scientists just discovered a planet orbiting a star in an extra-solar system. The star has a surface temperature Ts = 10000 Kelvins and a radius Sr = 1x109 meters. Scientists also measured the distance (D) between the star and the planet as D = 2 AU - 3.0x1011 meters. The solar power per unit area from the star's surface (Ps) can be calculated from the star's surface temperature Ts (10000 Kelvins) by the Stefen-Boltzman law Ps=0(Ts)4, where o is Stefen-Boltzman constant (5.67 x 10-8 Watt/meter2/Kelvin4). What is the solar power per unit area from the star's surface (Ps)? O Ps ~ 2.87 x 108 Watt/meter2 O Ps ~ 5.67 x 108 Watt/meter2 O O Ps ~ 2.87 x 10 Watt/meter2 Watt/meter² Ps ~ 5.67 x 10⁹ QUESTION 2 The solar power (Ps) decreases from the star's surface to the distance at the planet. Assuming the solar power per unit area at the distance of the planet as Pp, we have Pp=Ps(Sr/D)2, where…arrow_forwardJust select the correct one!arrow_forwardA star that is moving toward Earth will a. have its spectral lines shifted to the red. b. have its spectral lines shifted to the blue. c. appear hotter than it actually is. d. appear cooler than it actually is. e. appear dimmer than it actually is.arrow_forward
- Suppose a spectral line from an object in space was shifted from 5007.0 to 5100.0 Angstroms. What can we tell about this object? A) It is a star. B) It is very cold. C) It is blueshifted, hence coming towards us. D) Its radial velocity is positive, meaning it is moving away from us. E) It is a planet in a distant galaxy. F) It is an exoplanet.arrow_forwardHow Do We Know? Why is it important that a hypothesis make testable predictions?arrow_forwardWhat is the difference between the daily and annual motions of the Sun?arrow_forward
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