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Explaining how capacitors work

Capacitors work through the build up of current on their two opposing plates. Current in the form of negatively charged electrons builds up on one plate which in turn repels electrons on the other plate maki...
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Answered by Ryan M. • Physics tutor
3321 Views

What is the escape velocity of an object leaving a planet mass M, radius R?

As the object leaves the surface of the planet, it loses kinetic energy and gains gravitational potential energy. Through conservation of energy we know the loss of kinetic energy must be equal to the gain o...
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Answered by Thomas R. • Physics tutor
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The roar of a tiger in a zoo can be heard by visitors at the entrance, even though the tiger can not be seen because there is a hill in the way. Name and explain this effect.

This effect is called diffraction. This occurs when waves spread over obstacles or through gaps.
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Answered by Matilda C. • Physics tutor
3285 Views

How would we calculate the distance covered by a train that starts at rest, then accelerates to 5km/hr in 30 mins then stays at this constant speed for 12 minutes?

I would draw the situation Then use bring out the relevant SUVAT equationsI would explain how the equations work to give the student some intuitionThen carry out the problem step by stepThen I would ask if t...
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Answered by Harrison L. • Physics tutor
2289 Views

If photons of wavelength 0.1nm are incident on a 2m x 2m Solar Panel at a rate of 2.51x10^15s^-1, calculate the intensity, I, of the photons on the Solar Panel.

If wavelength = 0.1nm, we know (as E=hc/λ ), the energy provided by each photon, E= 1.99x10 15 J .Therefore, if they hit the panel at a rate of 2.51x10 15 s -1 , we know Power = Energy x Rate, =4.99WIntensit...
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Answered by Sam H. • Physics tutor
2458 Views