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Using Fermat's Principle explain why it makes sense for light be refracted when crossing from one medium into another that has a different refractive index.

Fermat's Principle states that light will always take the path of least travel TIME (NOT DISTANCE), at a first glance it appears that the path of least time would be a straight line from A to B, but this ...

Answered by Sam H. • Physics tutor

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What is the de Broglie wavelength of a dust particle that has a mass of 1e-10 kg and a velocity of 0.05m/s?

From the question asked, we need to identify the key bits of information.

Firstly, we are asked to find the de Broglie wavelength, so we write down the de Broglie relation:

lambda = h/p

...

Answered by Josh H. • Physics tutor

7914 Views

Given a projectile is launched, from rest, at an angle θ and travels at a velocity V, what is the range and path of motion of the projectile? (Ignore air resistance.)

First, find the formula for the time taken, t, for the projectile to travel the distance. Using the fact that the projectile reaches a velocity of zero at a time of 0.5t when at its maximum height and acc...

Answered by Oskar D. • Physics tutor

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A 70Kg person jumps out of a plane and deploys a parachute, once the parachute is open the wind resistance acting on the person and the parachute is 900N. What is the direction and magnitude of the persons acceleration.

We start off by working out all the forces acting on the person and they're parachute, because they are joined together they can be considered as one object. We know the wind resistance and the only other...

Answered by Joe C. • Physics tutor

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