Physics
The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by

Johannes Kepler
Copernicus
Galileo
Martin Luther

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

The question is incomplete because the masses of the spheres are not given.
Both the spheres will reach the ground simultaneously.
A will reach the ground first.
B will reach the ground first.

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