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STEP 1: Draw a diagram!

Remember to include all the useful information you are given in the question i.e. the initial velocity of the ball (5m/s at 30 degrees above the horizontal)...

The first thing to do as with any mechanics question is draw a force diagram with the weight (mg), the friction (F) and the normal reaction (R). As we are finding the smallest coefficient of friction poss...

The photoelectic effect is when photoelectrons are released from a metal that light is incident upon. The photoelectrons are only emitted when the photons of light are above a certain threshold frequency ...

First we must decide how we can begin to solve the problem. With problems such as these it is best to split the velocity into a vertical and horizontal component. To do this we construct a triangle, this ...

The photoelectric effect refers to the emmision of electrons from a surface, usually a metal, as a result of shining light (EM radiation). The light is absorbed by the electrons on the surface and thus th...