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Why does atmospheric pressure drop when altitude increases?

(Question can be sketched with a graph) Firstly, in order to have atmospheric pressure, air molecules must collide with a surface, in this case the face of the Earth. As you gain altitude (height from face o...
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Answered by Henry S. • Physics tutor
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Describe how a stationary wave is formed at a boundary?

A stationary wave is a wave formed by the superposition of two progressive waves. These waves must have equal amplitude frequency and speed. They must also be travelling in opposite directions. When a wave i...
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Answered by Oliver E. • Physics tutor
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A small ball is projected with speed 15 m/s at an angle of 60 degrees above the horizontal. Find the distance from the point of projection of the ball at the instant when it is travelling horizontally.

If we break down the velocity vector into its x and y components, then the point at which the ball would be moving horizontally is the point where the y velocity is zero. The y velocity decreases initially d...
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Answered by Dimitar D. • Physics tutor
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A ball is thrown downwards from a height of 10m with speed of 5m/s, assuming g=10m/s^2, calculate the final velocity of the ball when it hits the ground

First recall the suvat equation: v^2=u^2+2as. It is always handy to draw a diagram in physics to illustrate the problem. Next, using u=5, a=10, s = 10, solve for v in the suvat equation, arriving at the fina...
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Answered by Sachin V. • Physics tutor
2736 Views

Rutherford’s alpha particle scattering experiments gave what evidence about an atom?

Before we can look at the evidence we need to look at the observations from the experiment. During the session we will go through the experiment and then the observations to deduce the atom theory - and how ...
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Answered by Anmol S. • Physics tutor
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