Kinematics Problem
In a circus show a clown who is sitting on a post with height,H drops an apple to the ground.At the same time another clown throw an orange vertically upward from ground with speed 11 m/s.If both...
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Why Earth does not collide with the sun?
If our earth rotates around sun in discrete orbits, then why it doesn’t collide with Sun because of gravitational force acting between both bodies ? Answer: Earth is moving around the sun in such a way...
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String Theory
String theory suggests 11 dimensions. If the Big Bang involved a sudden expansion of three of those dimensions into the space we know today, is it possible that the energy for the Big Bang and...
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Relative Dimensions
Could u pls read my below theory of the universe [Ramkumar posted this] and pls contact me when done with ur real frank comments….. Assumption:Matter is Infinitely divisible… Hypothesis: if so we can...
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What physical phenomenon is there that a black hole has a high gravity?
What physical phenomenon is there that a black holehas a high gravity? Simulated gravitational lensing (black hole going past a background galaxy). (Photo credit: Wikipedia) Sona asked Related articles...
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Parallax Method to determine the distance of stars
WHAT IS THE WAY TO MEASURE THE DISTANCE OF DISTANT OBJECTS LIKE STARS WITH THE HELP OF PARALLAX METHOD SHWETANSU asked. Parallax is a displacement or difference in the apparent position of an object...
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Speed of Gravity
Why hasn’t anyone measured the speed of gravity yet? As in, how long does it take for the gravitational field of a mass to affect another mass? Musaddiq Sajjad asked. Answer: Who said that speed of...
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Question from Special Relativity
A spacecraft starts from earth moving at constant speed to planet A which is 20 light-hour away from Earth. It takes 25 hour (according to an earth observer) for a spacecraft to reach this planet....
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Conservation of linear momentum – Problem
Astronauts Mr.X and Mr.Y float in a zero gravity space with no relative velocity to one another. Mr. Y throws a mass of 5 kg towards X with speed 2 m/s. If Mr. X catches it, the change in velocity of X...
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Weightlessness in a satellite
Guion Bluford Experiences Weightlessness on the KC-135 – GPN-2002-000148 (Photo credit: Wikipedia) Why does an astronaut feel weightless in a space capsule orbiting the earth? I’ve gotten a key point...
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