Hey folks I been going through past exam papers and got 4 questions which are hard to follow, for those that know please provide a detailed step by step guide. I have completed most of the previous parts of each question which got me some extra values. ======= Question 1 OK heres what I have worked out so far: Volume = 5*10^-3 Mass = 8*10^-3 Pressure = 900000 n = 2 molecular mass = 4 r.m.s Speed of all molecules = 1300 Question asks the r.m.s speed of all molecules when the Kelvin temperature has doubled. All I know is that speed is proportional to temperature. ======= ======= Question 2 Should be quick and simple Use an ideal gas equation and kinetic theory formula pV = (1/3)Nmc^2 to show the equivalant formula is U = N * (1/2)mc^2 ====== ====== Question 3 Pressure = 1.5*10^16 Density = 1.8*10^5 r.m.s Speed = 500000 Number of protons per m^3 = density/proton mass = 1.08*10^32 Question asks me to calculate the number of moles per m^3 and then the temperature. ====== ====== Question 4 Concerning a water radiator Metal sheet dimensions = 0.9*1.5*0.005m Solar Radiation arrives at 350W Water pumped at (0.45/60)W Temp' Difference = 26 - 15 degs = 11 degs Mass of water = 1kg Heat Capacity = 4200 Calculate the percentage of solar energy transferred to water. Then, using the formula Q/t = -kA(temp diff/x) Make a rough estimate of the temperature difference between top surface and bottom of aluminium sheet. Any help would be great!