Questions
In a cosmic event, suppose a planet heavier than the earth with mass KM (K > 1) and radius K'R (K' > 1) passes through a path near the earth (M and R are the mass and radius of earth).At what closest distance from surface of planet, we are in danger of being thrown into space:
detailed solution
Correct option is D
We will be thrown into space, if weight mg is equal to gravitational force due to the planet. If y is the closest distance.GMmR2=mg=G(KM)mK′R+y2K′R+y2=KGMgy=KGMg1/2−K′RTalk to our academic expert!
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3 particles each of mass m are kept at vertices of an equilateral triangle of side L. The gravitational field at centre due to these particles is
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