28 copernican revolution heliocentric model planets

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
28. Copernican Revolution- heliocentric model, planets orbit the sun in circular orbits, moon orbits Earth. 29. Tycho- built an observatory, measured positions of objects over 30 years to an accuracy of 1’, found a nove(new star), measured a parallax proving it was near Venus. 30. Kepler’s 3 laws. 1- orbit of each planet around the sun is an ellipse with the sun at one focus. 2- as a planet moves around its orbit, a line connecting the planet and the sun sweeps out equal areas in equal times(consequence-planets move faster when they are closer the the sun), 3- more distant planets orbit the sun at slower average speeds than closer plants, p^2=a^3 31. ellipse- a conic section produced by the intersection of a plane with a cone when the plane is passed through the cone at an angle to the axis other than 0 degrees or 90 degrees. semi-major axis- half of the longer axis of an ellipse, semi-minor axis- ,eccentricity-a measure of the departure of an ellipse from circulatory; the ratio of the distance b/n the two foci of an ellipse to its major axis. 32. Galileo’s observations of phases of venus were proof that it orbits the sun, not Earth 33. Newton’s 1st- An object in motion will remain in motion unless acted upon by an outside force. An object as rest will remain at rest unless acted upon by an outside. 2nd- A net force causes a change in motion such that Fnet=Ma =mass times acceleration. Thus, if the same force is applied to two objects with different masses, the less massive object will be accelerated more. 3rd-for every force there is an equal and opposite force
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
34. Sun’s gravitational pull causes planets to orbit the Sun, direction the force is pointed- towards the Sun. 35. Weight-force equal to the mass of an object multiplied by the local acceleration due to gravity. Mass-property of matter defined by its attractive force on other objects. 36. Astronauts orbiting the Earth are weightless because of the vacuum in space. 37. Bound orbit- a closed orbit in which the velocity is less than the escape velocity. Unbound orbit-an orbit in which the velocity is greater than the escape velocity. 38. Lunar Eclipse: moon moves into the shadow cast by the Earth. Solar: moon is between the earth and sun. The moons shadow falls on part of earth 39. Bound orbit: elliptical/circular; Unbound: hyperbolic/parabolic.. the object is going faster than escape velocity.
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern