InterviewSolution
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InterviewSolution
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Choose the correct alternative: 1. If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of Its kinetic/ potential energy. 2. The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s influence. |
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Answer» 1. Kinetic energy: The potential energy of a satellite rotating in its orbit is zero. The total energy of a system is the sum of its kinetic energy (+ve) and potential energy. Since the earth satellite system is a bound system. The satellite has a negative total energy. So, the energy of the satellite is the negative of its kinetic energy. 2. Less: An orbiting satellite has more energy than a stationary object at the same height. This additional energy is provided by the orbit. It requires lesser energy to make it move out of the earth’s influence than a stationary object. |
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