UNIVERSE
SATELLITESICY BODIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Is the same at all points in the orbit
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Is greatest when it is closest to the earth
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Is greatest when it is farthest from the earth
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Goes on increasing or decreasing continuously depending upon the mass of the satellite
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Detailed explanation-1: -It is slowest at the farthest point and fastest at the nearest point.
Detailed explanation-2: -Where in an elliptical orbit is the speed of a satellite maximum? In an elliptical orbit, the speed would be the largest at the closest point (perigee).
Detailed explanation-3: -At periapsis, when the satellite is at its closest to the planet and hence moving at its fastest, the kinetic energy component of the total energy is at its greatest and the gravitational potential energy is at its minimum (i.e. its most negative value).
Detailed explanation-4: -According to Kepler’s first law, a satellite revolving around the Earth in an elliptical orbit will have Earth situated at one of its foci. So, the centre of Earth coincides with the focus of the ellipse. It is known that the focus of an ellipse lies on the plane of the ellipse i.e. plane of the orbit.
Detailed explanation-5: -Energy Analysis of Elliptical Orbits As mentioned above, the force of gravity does work upon a satellite to slow it down as it moves away from the earth and to speed it up as it moves towards the earth.