ASTR 101 Lecture Notes - Lecture 14: Cross Purposes, Galilean Moons, Exoplanet

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goldwolf870

6 Sep 2016

School

Queen's University

Department

Physics, Engineering Physics and Astronomy

Course

ASTR 101

Professor

David Alan Hanes

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Stone: stone does not exactly fall to ground. Stone goes towards earth, and earth rises to meet rock. Teeter-totters: same weight at equal distance = balanced. Different weights, heavier person moves closer to fulcrum to be balance. In this case, light person travels in long arc, heavy person moves up and down only a little. Similar reasoning applies to the behaviour of two objects in mutual orbit under the influence of gravity. Earth and moon feel a gravitational influence of the attraction between them, but since the earth is so massive, it would move only a little. The moon moves in a larger orbit around their common centre of gravity = barycentre. Moon moves in a big orbit while earth wobbles back and forth. Our solar system has a very dominant central sun, with more than 99% of the mass.

Related Questions

1)The earth makes a gravitational force on the moon, and themoon makes a gravitational force on the earth. Which of theseforces is larger?
a)The gravitational force of the earth on the moon isgreater.
b)The gravitational force of the moon on the earth isgreater.
c)The two forces are equal.
d)There is no way to tell.
2) Suppose you could climb a ladder whose height is equal to theradius of the earth. At the top of this ladder
a) your weight would be the same as it is at the surface of theearth.
b)your weight would be Â½ its value at the surface of theearth.
c)your weight would be Â¼ its value at the surface of theearth.
d) you would be weightless.
3) The moon has potential energy because it is near the earth. Ifit were twice as far from the earth as it is now,
a) its potential energy would be higher than it is now.
b) is potential energy would be less than it is now.
c) its potential energy would be the same as it is now.
4) Suppose a satellite has a circular orbit around the earth. Whydoes it stay in orbit?

a)Because gravity does not act on it in the vacuum of space.
b)Because it is in equilibrium; the inward pull of gravity isbalanced by an outward force.
c) Because as it moves tangentially, the satellite is acceleratedby the force of gravity toward the center of the earth.

Which of the following statements is true?

	Planets move in circularorbits, with the Sun in the center of the orbit.
	Planets move in circularorbits, with the Sun located off-center.
	Planets move in ellipticalorbits, with the Sun in the center.
	Planets move in ellipticalorbits, with the Sun located off-center.

PLEASE HELP ME PICK THE RIGHT ANSWER FOR EACH QUESTIONS. PLEASEWRITE OUT THE WHOLE ANSWER AND THE LETTER. THANK YOU!

ASTR 101 Lecture Notes - Lecture 14: Cross Purposes, Galilean Moons, Exoplanet

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