Explanation 1) Concept: We can use the concept of Newton’s law of gravitation and centripetal force . The gravitational force on the planet provides the centripetal force on the planet. We can use the expression of density and orbital speed. 2) Formulae: i) F = G M m r 2 ii) F c = m v 2 r iii) v = 2 π r T 3) Given: The uniform density of the spherical planet is ρ = 3.0 g c m 3 = 3.0 × 10 3 k g m 3 4) Calculations: a) According to Newton’s law of gravitation, the gravitational force acting on the spherical planet is F = G M m r 2 The gravitational force on the planet provides the centripetal force on the planet. Hence, the expression for centripetal force is F c = m v 2 r The gravitational force can be balanced by the centripetal force. Therefore, G M m r 2 = m v 2 r … ( 1 ) According to the expression of orbital velocity of star, v = 2 π r T v 2 = 4 π 2 r 2 T 2 Equation (1) becomes G M m r 2 = m r 4

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Author: David Halliday, Robert Resnick, Jearl Walker

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Central Force

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Chapter 13, Problem 80P

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a) Show that the shortest period rotation of planet is T=3πGρ

b) Calculate the rotation period of planet.

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Chapter 13, Problem 79P

Chapter 13, Problem 81P

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Fundamentals of Physics Extended

Ch. 13 - In Fig. 13-21, a central particle of mass M is...Ch. 13 - Prob. 2Q Ch. 13 - In Fig. 13-23, a central particle is surrounded by...Ch. 13 - In Fig. 13-24, two particles, of masses m and 2m,...Ch. 13 - Prob. 5Q Ch. 13 - In Fig. 13-26, three particles are fixed in place....Ch. 13 - Rank the four systems of equal- mass particles...Ch. 13 - Figure 13-27 gives the gravitational acceleration...Ch. 13 - Figure 13-28 shows three particles initially fixed...Ch. 13 - Figure 13-29 shows six paths by which a rocket...

Ch. 13 - Figure 13-30 shows three uniform spherical planets...Ch. 13 - In Fig. 13-31, a particle of mass m which is not...Ch. 13 - ILW A mass M is split into two parts, m and M m,...Ch. 13 - Moon effect. Some people believe that the Moon...Ch. 13 - Prob. 3P Ch. 13 - The Sun and Earth each exert a gravitational force...Ch. 13 - Miniature black holes. Left over from the big-bang...Ch. 13 - GO In Fig. 13-32, a square of edge length 20.0 cm...Ch. 13 - One dimension. In Fig. 13-33, two point particles...Ch. 13 - In Fig. 13-34, three 5.00 kg spheres are located...Ch. 13 - SSM WWW We want to position a space probe along a...Ch. 13 - Prob. 10P Ch. 13 - As seen in Fig. 13-36, two spheres of mass m and a...Ch. 13 - GO In Fig. 13-37a, particle A is fixed in place at...Ch. 13 - Figure 13-38 shows a spherical hollow inside a...Ch. 13 - Prob. 14P Ch. 13 - GO Three dimensions. Three point particles are...Ch. 13 - GO In Fig. 13-40, a particle of mass m1 = 0.67 kg...Ch. 13 - a What will an object weigh on the Moons surface...Ch. 13 - Mountain pull. A large mountain can slightly...Ch. 13 - SSM At what altitude above Earths surface would...Ch. 13 - Mile-high building. In 1956, Frank Lloyd Wright...Ch. 13 - ILW Certain neutron stars extremely dense stars...Ch. 13 - Prob. 22P Ch. 13 - Prob. 23P Ch. 13 - Two concentric spherical shells with uniformly...Ch. 13 - A solid sphere has a uniformly distributed mass of...Ch. 13 - Prob. 26P Ch. 13 - Figure 13-42 shows, not to scale, a cross section...Ch. 13 - Prob. 28P Ch. 13 - Prob. 29P Ch. 13 - In Problem 1, what ratio m/M gives the least...Ch. 13 - SSM The mean diameters of Mars and Earth are 6.9 ...Ch. 13 - a What is the gravitational potential energy of...Ch. 13 - Prob. 33P Ch. 13 - Prob. 34P Ch. 13 - GO Figure 13-44 shows four particles, each of mass...Ch. 13 - Zero, a hypothetical planet, has a mass of 5.0 ...Ch. 13 - GO The three spheres in Fig, 13-45, with masses mA...Ch. 13 - In deep space, sphere A of mass 20 kg is located...Ch. 13 - Prob. 39P Ch. 13 - A projectile is shot directly away from Earths...Ch. 13 - SSM Two neutron stars arc separated by a distance...Ch. 13 - GO Figure 13-46a shows a particle A that can he...Ch. 13 - a What linear speed must an Earth satellite have...Ch. 13 - Prob. 44P Ch. 13 - The Martian satellite Photos travels in an...Ch. 13 - The first known collision between space debris and...Ch. 13 - Prob. 47P Ch. 13 - The mean distance of Mars from the Sun is 1.52...Ch. 13 - Prob. 49P Ch. 13 - Prob. 50P Ch. 13 - Prob. 51P Ch. 13 - The Suns center is at one focus of Earths orbit....Ch. 13 - A 20 kg satellite has a circular orbit with a...Ch. 13 - Prob. 54P Ch. 13 - In 1610, Galileo used his telescope to discover...Ch. 13 - In 1993 the spacecraft Galileo sent an image Fig....Ch. 13 - Prob. 57P Ch. 13 - Prob. 58P Ch. 13 - Three identical stars of mass M form an...Ch. 13 - In Fig. 13-50, two satellites, A and B, both of...Ch. 13 - Prob. 61P Ch. 13 - Prob. 62P Ch. 13 - SSM WWW An asteroid, whose mass is 2.0 10-4 times...Ch. 13 - A satellite orbits a planet of unknown mass in a...Ch. 13 - A Satellite is in a circular Earth orbit of radius...Ch. 13 - One way to attack a satellite in Earth orbit is to...Ch. 13 - Prob. 67P Ch. 13 - GO Two small spaceships, each with mass m = 2000...Ch. 13 - Prob. 69P Ch. 13 - Prob. 70P Ch. 13 - Several planets Jupiter. Saturn, Uranus are...Ch. 13 - Prob. 72P Ch. 13 - Figure 13-53 is a graph of the kinetic energy K of...Ch. 13 - The mysterious visitor that appears in the...Ch. 13 - ILW The masses and coordinates of three spheres...Ch. 13 - SSM A very early, simple satellite consisted of an...Ch. 13 - GO Four uniform spheres, with masses mA = 40 kg,...Ch. 13 - a In Problem 77, remove sphere A and calculate the...Ch. 13 - Prob. 79P Ch. 13 - Prob. 80P Ch. 13 - Prob. 81P Ch. 13 - Prob. 82P Ch. 13 - Prob. 83P Ch. 13 - Prob. 84P Ch. 13 - Prob. 85P Ch. 13 - Prob. 86P Ch. 13 - Prob. 87P Ch. 13 - Prob. 88P Ch. 13 - Prob. 89P Ch. 13 - A 50 kg satellite circles planet Cruton every 6.0...Ch. 13 - Prob. 91P Ch. 13 - A 150.0 kg rocket moving radially outward from...Ch. 13 - Prob. 93P Ch. 13 - Two 20 kg spheres are fixed in place on a y axis,...Ch. 13 - Sphere A with mass 80 kg is located at the origin...Ch. 13 - In his 1865 science fiction novel From the Earth...Ch. 13 - Prob. 97P Ch. 13 - Prob. 98P Ch. 13 - A thin rod with mass M = 5.00 kg is bent in a...Ch. 13 - In Fig. 13-57, identical blocks with identical...Ch. 13 - A spaceship is on a straight-line path between...

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a) Show that the shortest period rotation of planet is T = 3 π G ρ b) Calculate the rotation period of planet.

Solution Summary: The author explains Newton's law of gravitation and centripetal force to calculate the rotation period of the planet.

Concept explainers

To find:

a) Show that the shortest period rotation of planet is T=3πGρ

b) Calculate the rotation period of planet.

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Chapter 13 Solutions

a) Show that the shortest period rotation of planet is T = 3 π G ρ b) Calculate the rotation period of planet.

Solution Summary: The author explains Newton's law of gravitation and centripetal force to calculate the rotation period of the planet.

Concept explainers

To find: a) Show that the shortest period rotation of planet is T=3πGρ b) Calculate the rotation period of planet.

Want to see the full answer?

Chapter 13 Solutions

To find:

a) Show that the shortest period rotation of planet is T=3πGρ

b) Calculate the rotation period of planet.