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Physics
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A 25 micro farad is charged until the potential difference across it is 500V. Calculate the charge stored at this moment.

The formula to be used here is C = Q / V. Where C = capacitance, Q = charge and V = potential difference. First we can put in the values to get 25 * 10^-6 = Q / 500. This can be rearranged to Q = 500 * 25...

CW
Answered by Cameron W. • Physics tutor
2158 Views

Explain why atmospheric pressure decreases with increasing altitude. (3 marks)

Firstly, pressure is created by air molecules colliding with a surface. At an increased altitude there are fewer air molecules, and therefore a larger average distance between them. This means at this hig...

EB
Answered by Emily B. • Physics tutor
18699 Views

A ball is released from height h w.r.t. the ground. Draw a qualitative height versus time diagram of the ball bouncing in a non-ideal case.

In a non-ideal case, there will be energy loss in heat when the ball touches the ground. In particular:Kn=aKn-1, where Kn-1...

EP
Answered by Emanuele P. • Physics tutor
2540 Views

A car of mass M and a maximum power output of P is on an rough inclined plane Θ to the horizontal. What is the maximum velocity (v). Coefficient of friction=μ and air resistance=kv where k is constant

At the maximum velocity the driving force of the car is equal to the sum of the opposing forces: Fdriving=Ffriction+Fair+mgsinΘ Ffriction=mgμcosΘ F

JB
Answered by Joel B. • Physics tutor
2095 Views

Help! How do I rearrange equations?

Being able to manipulate equations is a very useful skill in Physics. Consider, for example, the relationship between mass, density and volume.
m = ρ x v
In the above equation, the mass, m ...

IP
Answered by Ijeoma P. • Physics tutor
2151 Views

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