Questions
A satellite is revolving round the earth with orbital speed . If it stops suddenly, the speed with which it will strike the surface of earth would be ( = escape velocity of a particle from the earth’s surface)
detailed solution
Correct option is D
if orbital velocity is v0 kinetic energy is 12mv02 and potential energy -mv02 when it is stopped it has only potential energywhen it hit the surface of the earth potential energy becomes -GMmR= -mgR= -12mve2 loss in potential energy = kinetic energy 12mve2 -mvo2=12mv2 v=ve2-2v02Talk to our academic expert!
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The masses, each of mass m are kept on the vertices of an equilateral triangle of side a. Find the work needed to be done to change the length of the triangle twice of its original value.
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