Question

10. Choose the correct alternative:
(a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is
negative of its kinetic/potential energy.
(b) 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. explanation also plz​

Answer 1

Answer:

none of these is correct

Explanation:

1) yes , there is a zero potential energy in infinity but the satellite is in particular distance from the earth so it can't be consider as infinity distance.

energy of satellite 's orbiting the earth is negative because it is attracted by earth's gravitational force so it can't escape from the earth's gravitational field

2) escape speed (the speed required to project the object from earth's influence) is

escape speed = √2gR

where g is acceleration due to gravity and R is radius of earth

SO, escape speed is independent of mass of the object and whether the object is moving or at rest.

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