____ How does an object in circular orbit differ from an object in elliptical or
ID: 1571030 • Letter: #
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____ How does an object in circular orbit differ from an object in elliptical orbit? (Choose as many as apply.) The speed of an object in a circular orbit is of constant, but the speed of an object in an elliptical orbit varies. The sum the kinetic and potential energy of an object in circular motion is constant, but it varies for objects in elliptical orbit. The potential energy of an object in circular motion varies from point to point in its orbit, but the potential energy is constant at all points in an elliptical orbit. A circular orbit has two foci: an ellipse has only one. ____Ignoring the gravitational effects of all astronomical bodies other than the earth, for a rocket to move from the surface of the earth to a point infinitely far away from the surface of the earth, it must be launched horizontally with an initial velocity of more than 11.2 km/s vertically with an initial velocity of more than 11.2 km/s with an initial velocity directly proportional to the mass of the object. A rocket cannot be launched to a point infinitely far away from the surface the earth because to do so would require an infinite initial velocity. _____ If you are in a spaceship and see a clock running slow and length contracted in a in passing spaceship, how would the occupants of that spaceship see time and length in your spaceship They would not see your spaceship. They would see time running slowly and length in your spaceship. They would see time running slowly and length contracted in your spaceship They would see no difference between your time and space and their time and space. They would see time running more quickly and length extended in your spaceship. _____ Belinda takes a trip in a rocket ship that travels at near-light speed while her twin Melinda stays at home. Which of the following statements is true? When Belinda arrives back at earth, Melinda will be much younger than Belinda, because from Belinda's frame of reference on the rocket, time in Melinda's frame of reference was passing slowly. When Belinda arrives back at earth, Melinda will be much older than Belinda, because from Belinda's frame of reference on the rocket, time in Melinda's frame of reference was passing quickly. When Belinda arrives back on earth, Melinda will be much older than Belinda because Belinda's frame of reference on the rocket is not an inertial reference frame. When Belinda arrives back on earth, and Belinda will be exactly the same age, since during the trip they each will have seen passing slowly in the other's reference frame. These two time dilation effects will cancel each other out. ______ Einstein's famous equation E_0 = mc^2 means that matter is converted to energy when it travels at a speed equal to the square of the speed of light the rest mass of an object varies with the speed of the object an object has no energy unless it is moving matter can be converted into energy and vice versa.Explanation / Answer
20. A the speed of an object in a circular orbit is constant, but the speed of an object in an elliptical orbit varies
21. B.vertically with an intial velocity of more than 11.2km/s
22. C they would see no differences between your time and space and their time and space
24. A and B
25. D matter can be converted into energy and vice versa
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