Physics
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?

Great circle
Hyper–parabolic
Circle
Parabolic

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and remain floating

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.

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