In childhood we were made to do an activity with comb and paper pieces to understand electrostatic force. But I notice after rubbing comb in hair , it attract paper pieces very well but after some time again I tried(not rubbing again) with same comb , it is able to attract only few of them, it s...

May be a silly and simple question, but I've been wondering if: The speed of light is constant, and When we're moving in the same direction (where both the emitter and the receiver move with the light direction) we would be making it take more time for the light to reach the other end. Conversel...

I propose the following thought experiment: Suppose we have a beam of identically prepared electrons that is splits into two. The first goes through detector A that detects the $x+y$ where $x$ is the coordinate along x direction and $y$ is the coordinate along the $y$ direction. Then, we measure ...

Two balls A and B are both thrown with horizontal initial velocities of 6 m/s and 8 m/s from the edge of a vertical cliff. Their initial velocities are perpendicular and the points where they hit the ground are 120 meters apart. Find the height of the cliff. The answer given is height of clif...