Tidal energy. What will happen if we keep using tidal energy for very long? Moon will move away or will come close?

Will high Vx will change Vy? Can we change velocity in a direction without applying force in that direction?

I guess Yes.

as very high Vx will increase V, so will the mass be increased, becaz of relativity, so to keep Py constant Vy have to reduce as we know momentum is =M.V.

Can a charge apply force on itself?

I think Yes.

As we know two charges interact using photons. Photos is em wave and travel at speed of light.
But em wave travel aat different speed in different medium.
So we can plan a system such that the em wave will travel through the medium at a speed slower than the speed of light and the charge will travel outside the medium at higher speed. And the charge will interect with its own photon and will feel force.

Is it possible?

What is spark?

Sparks are the bright glows due to tiny masses of matter heated to extremely high temperature. It could be a small amount of air in between two electrodes held at high enough electrical potential difference so as to heat it by the current, it could be flying mass of specks of metal particles in a sparkler heated by chemical burning, it could be a flying splinter resulting from the striking of two metallic bodies against each other, or it could be a small sized particle separated from a large body of stone locally heated by friction with another object. In all these cases and more, one observes a flying spark glowing bright.

# 1. Let's start Physics! (how to study it)

# 1. Let's start Physics! (how to study it)

Battery/Cell explained simply : Chemical Energy driven charge pump.

Battery explained simply : Chemical Energy driven charge pump.

Description :
We can say battery is a charge pump which takes energy from the chemical energy of its constituents materials.
It pumps + ve charge from the -ve sphere to + sphere.
When the extranal circuit is not complete the pump stops and do no work.
When the external circuit is complete the + charge start moving from + sphere to -ve sphere and the pump also starts pumping more charge. Now it takes energy from the chemical energy of its contituents. As time passes the chemical enegry will keep reducing.
After sufficient time the energy will not be sufficient to run the pump and full rate or not run at all.
Then we say the battery is dead.

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Rank The applied force (Highest magnitude first), time of contact is same in both the case.

1. Ball collided with wall and got bounced back.

2. Ball collided with the wall and got stuck there.