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The graviational potential at a point in space is the work done to move a unit mass from infinite (very far away) to the point in question. The gravitational potential V at a point outside a single spheri...
When the object is at rest on the platform it has no kinetic energy, but only potential energy. The potential energy is mgh where m is the mass of the object, g the gravitational acceleration and...
An alpha particle has a much larger volume than a β particle, so when passing by an atom it is more likely to collide with an electron and knock it out of the atom causing the atom to be ionised (meaning ...
[I would use the whiteboard to draw diagrams as I was talking]A good analogy for circuits is that of water pipes. The wires are nice wide pipes with no resistance to flow. Resistors are sections of ...
Using the SUVAT equation: v = u + atv = ?u = 20a = 2t = 10v = 40m/s
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