# ASTRO_1_HOMEWORK_4_QUESTIONS - Astronomy 1 [Alexia Marquez]...

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Astronomy 1Homework 4[Alexia Marquez]Section:Padilla T 1PMASTRO 1 - HOMEWORK 41. Use Kepler’s third law and the information in the book about the moon’s orbit tocalculate the orbital period of the many satellites in “low Earth orbit”. You need to knowthe semi- major axis for these satellites. You can assume that it is equal to the radius ofthe earth. Your answer is the length of the day/night cycle as seen by orbiting astronauts.
3. Explain rocket propulsion. This is the method I used in class to accelerate myself in thelittle red wagon.
4. How can we use the Moon’s orbital motion, plus the distance an apple falls in onesecond, to determine the dependence of the gravitational force formula on the distancebetweentwo bodies? You don’t have to be quantitative, you just have to explain the idea.
5. How does the block and feather demo (or Galileo’s dropped cannonballs) show that thegravitation force on a body (like a falling apple, or block, or feather, or cannonball) isproportional to the mass of the body (all else being equal)?
Astronomy 1Homework 4[Alexia Marquez]Section:Padilla T 1PMbody through the rates at which an object hits the fllor is proportional to the mass ofan object.In the demo the block and the feather were dropped at the sameacceleration from the the same starting point but yet the block hit the ground firstdue to the block having a greater mass. If both object consisted of the same massthen they would have hit the ground at the same time .

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