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Explain how a standing wave is set up on a string fixed at both ends.

An oscillation is send down the string which is reflected at the other end. This leads to the superposition of two waves, the transmitted and reflected wave, on the string. At the ends, where reflection occu...
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Answered by Peter S. • Physics tutor
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Why does temperature effect the resistance of conductors?

The resistance of a conductor increases with temperature. This is because as the temperature increases the atomic lattice of the conductor has more energy so begins to vibrate more. This means it is more lik...
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Answered by Peter E. • Physics tutor
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Hanging on a branch of a tree, a monkey sees a hunter aiming a gun at him. The monkey lets go of the branch at the exact same time the bullet is fired. Explain why the bullet hits the monkey.

This question is also applicable to physics mechanics. Many would think the bullet will hit the monkey because it is travelling much faster than him. However, modelling the monkey as a particle and ignoring ...
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Answered by Akram H. • Physics tutor
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If a boy is stationary on a skateboard and jumps off forwards, why does the skateboard move backwards?

Momentum before the collision or separation must equal the momentum afterwards, this is called the conservation of momentum. The situation before had the skateboarder on the skateboard, both stationary. As m...
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Answered by Amy R. • Physics tutor
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How am I going to remember all of the particles I need to know? (A-level Physics)

(This is accompanied with a whiteboard drawn diagram)."Well, the way I solved this problem when I was doing my A-levels was to make a spider diagram. For instance, the particle zoo (the name given to th...
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Answered by Joe P. • Physics tutor
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