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First we want to state what Newton's first law is. 

Newton's first law of motion states that an object at rest will remain at rest, or if in motion, will remain in motion at a constant ve...

Initially the momentum is zero.

Due to conservation of momentum, the alpha particle and radium nucleus must gain equal but opposite momentum.

The mass of the radium nucleus ...

If you think of electrons as tennis balls being passed around by a circle of people, then a capacitor occurs when there is a gap between 2 people which is too large for the ball/electron to be passed o...

A pendulum bob will move fastest when the mass is at its lowest point (when x=0). The reason for this is that in the pendulum system energy is transferred between kinetic and gravitational potential en...

The centripetal force can be thought of as the force that causes circular motion.

When an object moves in a circle a force must always act on it, even when it moves at a constant speed. T...