Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Consider a planet that has a gravitational acceleration of 1.8 m/s2 at its surface. Assume that theplanet is spherical with a radius of 4300 km.a) Calculate the mass of the planet.b) Find the escape speed from the surface of this planet, assuming no air resistance.
Comet Halley orbits the Sun with a period of 76 years and in 1986, had a distance of closest approach to the Sun, its perihelion distanc Rp, of 8.9x1010 m.
a) What is the comet's farthest distance from the Sun, which is called its aphelion distance Ra?
b) What is the eccentricity of the orbit of comet Halley?
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- What is the escape speed of a satellite located at the Moon’s orbit about Earth? Assume the Moon is not nearby.arrow_forwardWhat is the orbital period of a satellite orbiting just above the surface of the asteroid in Problem 11?arrow_forwardAfter Cares was promoted to a dwarf planet, we now recognize the largest known asteroid to be Vesta, with a mass of 2.671020kg and a diameter ranging from 578 km to 458 km. Assuming that Vesta is spherical with radius 520 km, find the approximate escape velocity from its surface.arrow_forward
- Find the escape speed of a projectile from the surface of Jupiter.arrow_forwardComet P/1999 R1 has a perihelion of 0.0570 AU and aphelion of 4.99 AU. Using the results of the previous problem, find its speed at aphelion. (Hint: The expression is for the perihelion. Use symmetry ot rewrite the expression for aphelion.)arrow_forwardFIGURE 8.38 Comparison of a circular and an elliptical orbit. The semimajor axis of the ellipse is the radius of the circular orbit. At points I and J on the ellipse, the particles speed is the same as it would be on the circle. At perihelion P, the particles speed is too high to maintain a circular orbit, and at aphelion A, it is too low. G Case Study Comet Hale-Bopps elliptical orbit is described in Problem 63. Draw an energy graph for the Suncomet system. For points A, P, I, and J (Fig. 8.38, page 236), superimpose a bar chart on the energy graph.arrow_forward
- What is the orbital radius of an Earth satellite having a period of 1.00 h? (b) What is unreasonable about this result?arrow_forwardA planet has two moons of equal mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r. What is the magnitude of the gravitational force exerted by the planet on Moon 2? (a) four times as large as that on Moon 1 (b) twice as large as that on Moon 1 (c) equal to that on Moon 1 (d) half as large as that on Moon 1 (e) one-fourth as large as that on Moon 1arrow_forward
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