Recent content by Junkwisch

Homework Statement Water is flowing upwards through a vertical pipe. When a manometer is attached to the pipe in the manner shown in the diagram, the manometer fluid (mercury) is displaced by 10 cm as illustrated. Ignore friction in the pipe. (i) Express the pressure at point (1a) in terms of...

I don't think you have to, we only need to calculate the pressure before it enter the valve

Only for floor 10, the pressure reduction valve, 1metre after the elbow

Hi, for question 1 I assume you mean the pressure above the free surface of tank 2 which is, P2=Patm +100Kpa? If it is, this value is given by the question This is my working out for question 4, showing the two formulas I used

Homework Statement The water in the bottom tank (position 1) is pumped into!the!roof tank (position 2) through a long pipe (containing two elbows a and b separated by 1 meter) which discharges freely at a height 50 cm above the liquid surface in the upper tank. To fill up the upper water tank...

thank you for your help Simon, I have been going through much of my lecture note and recording in the recent days. It seems that the ideal gas law has nothing to do with this case. by using this equation saturation vapour pressure = 0.6108exp(17.27*T/T+237. 3), I got saturation vapour pressure...

Since it is a parcel of air, the volume is constant? thus the only that that will change is pressure? Can I use the ideal gas law in this case? "PV=nRT" I think it is nott possible for vapour pressure to be higher than saturated vapour pressure since it will precipitate (I'm not certain)

The question is in the attachment... "this is an old past exam question" for i) I assume that the pressure will remain constant (I'm not sure) since volume is likely to increase proportion to the decrease in temperature. (Is this correct?) Best Regards

ah, so only 1/4 of the mass of Ti is included, thank you ehild :D

Sorry, I forgot to attach the pic Junks

thank for your reply ehild the attachment here is what I did by finding 'a' from a single face. I got a new value for volume which will result in higher density :D. Since Ti is so small, do I still need to include it in the mass calculation? Junks

Homework Statement See attachment q2 for the perovskite structure The Attempt at a Solution For the perovskite structure, I assume that the lattice constant is equal to 2*(R1+R2+R3) and calculate the density based on this. Am I correct? (The attachment q2ans is my attempt on the...

Homework Statement "see attachment" "q1" Homework Equations V=\frac{-A}{r}+\frac{B}{r^{10}} A=5*10^-30 B=8*10^-121 V=potential energy r=interatomic separation distance Coefficient of thermal expansion = \frac{change in L}{L*change in T} The Attempt at a Solution I have...

I forgot to attach the question, here it is

Homework Statement "see attachment" Homework Equations PV=NkbT Change in entropy = Boltzmann Constant x In(Macrostate) The Attempt at a Solution for part A, I knew that PV=NKbT giving that pressure is 101300Pa volume is 1*10^-3 m^3, Kb is 1.38*10^-23 and T=300K I find N to...