ASTR BC 1753x Lecture Notes - Lecture 7: Semi-Major And Semi-Minor Axes, Orbital Period, Roygbiv

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apricotsalmon916

9 Sep 2016

School

Barnard College

Department

Physics and Astronomy

Course

ASTR BC 1753x

Professor

Mary Putman, David Kipping

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Document Summary

No, it depends on your mass (the acceleration is the same) The gravitational force would be a factor of 4 smaller than now. The force of gravity from the sun is stronger. If gravity is stronger, velocity must also be higher. Kinetic motion forward balanced by gravitational pull inward. Kepler"s simple equation, p^2 = a^3 i valid only for objects orbiting the sun (p in years and a in. Newton derived a more general version using his law of gravity. Where m1 and m2 are the masses of any 2 objects. A = semi-major axis (in m or km) Can get the semi-major axis (distance from star estimate) from period of planet and mass of star. 4 in kay (gravity) and ch. 5 in kay (light) Different wavelengths of light = the electromagnetic spectrum. Type of light described by wavelength or the frequency (f x lambda = c) In the visible our eyes recognize f (or lambda) as color.

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!

11: How fast would you need to travel a) to escape the gravitational pull of the sun? b) As the sun begins to die, it will become a red giant. This means that its mass will remain the same but its diameter will increase substantially. When the sun becomes a red giant will its escape speed be greater than, less than, or the same as it is now?

12: How fast would the moon need to travel in order to escape the gravitational pull of the Earth, if Earth has a mass of 5.98 X 10^24 kg and the distance from Earth to the moon is 3.84 X10^8 m?

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ASTR BC 1753x Lecture Notes - Lecture 7: Semi-Major And Semi-Minor Axes, Orbital Period, Roygbiv

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