Recent content by LivvyS

Ahh so you could take the dot product rather than the cross product of the vectors and theta would be the new variable?

Thanks a lot for the reply! Is it somehow related to the formula for magnetic field strength at a given distance from a wire: B= [PLAIN]http://scienceworld.wolfram.com/physics/pimg170.gifi / 2pi r? I am struggling to see from my books what else could be relevant.

Homework Statement A particle with charge q moves with velocity v near a long, straight wire which has a current I flowing through it which generates magnetic field B. Give an expression for the magnitude of the force on this particle in terms of q, v = | v | and the magnitude of the magnetic...

Thanks for the reply! So if the exponent of e is 0 then P(0) = A*1 so A = 8.23x106 But if this were true than the answer for a I calculated cannot be right, if so could you give me a clue as to what's wrong with it?

Homework Statement In 2000 the population of a country was estimated to be 8.23 million. In 2010 the population was 9.77 million. Assume that the number of people P(t) in millions at time t (in years since 2000) is modeled by the exponential growth function. P(t) = Aekt Find P(t) giving the...

Oh I see, so you then end up with Cv= R/ γ-1. Very helpful, thanks! Do you mean S2-S1 = Cv loge ((P2V2γ) / (P1V1γ))?

All help much appreciated, thanks guys!

If temperature were known and Emp calculated, would this correspond to the maximum value of f(E)/g(E)?

Cp=Cv+nR surely Cp is needed in order to find Cv? Im not even 100% certain that I am approaching this question correctly, I feel as though I've hit a bit of a wall with it. Perhaps I am trying to use the wrong formula?

Hi guys, If the value of v for which f(v) has its maximum value is known for a sample of a gas, is there a way of determining the corresponding maximum of f(E)/g(E)?

Problem statement: A sample of 8.02 × 10-1 moles of nitrogen gas ( γ = 1.40) occupies a volume of 2.00 × 10-2 m3at a pressure of 1.00 × 105 Pa and temperature of 300 K. It is isothermally compressed to half its original volume. It behaves like an ideal gas. Find the change in entropy of the gas...

Thanks for the quick reply! Is the same true of heat capacity at constant pressure?

Hi everyone, If you know the temperature rise of 2 moles of an ideal gas when a known amount of energy is transferred to it as heat, (hence are able to calculate cv by dU/dT); is the molar heat capacity simply half this value as it is half the number of moles?

Homework Statement 8.02 × 10−1 moles of nitrogen gas ( γ= 1.40) is contained in a volume of 2.00 × 10−2 m3 at a pressure of 1.00 × 105 Pa and temperature of 300 K. The sample is adiabatically compressed to half its original volume. IT behaves as an ideal gas. (i) What is the change in...

I have been having to self teach this bit from a textbook...I think ill need to start from the beginning again. Thanks for everything.