Recent content by johnconnor

  1. J

    Cambridge Physics Problems: Electrostatics

    Actually I'm still quite stuck at parts (a) and (b). I haven't gone through the HCl part. What about this, Infinitum? =)
  2. J

    Cambridge Physics Problems: Electrostatics

    Well yeah I can kind of explain the first part too - albeit in a un-professional way. But for the remaining parts, I was like WTH coz I've never dealt with electrostatic questions of this length. The guide says: One thing about CIE Physics is that it deals with rather narrow topics and...
  3. J

    Cambridge Physics Problems: Electrostatics

    Before I go about trying to futilly solve the question, is this thing beyond a CIE A-Lv physics student's reach or not? Any comments on the difficulty of the question, and perhaps the reading material which you would recommend before I attempt the question? Thank you.
  4. J

    Year 12: Cambridge Physics Problem (Distance of O atom in atmosphere)

    As for the final part, the guide says What other comments have you got? I can't think of any... :P
  5. J

    Year 12: Cambridge Physics Problem (Distance of O atom in atmosphere)

    You're welcome! I'd appreciate yr participating in the discussions to solve the questions as a sign of thanks!
  6. J

    Year 12: Cambridge Physics Problem (Distance of O atom in atmosphere)

    You're right. The guide didn't mention anything about a variation with height at ten times the height too. Thanks. Will solve it now. p = (density)(rms square speed)/3 = (density)(temperature)/3 (using the proportion that rms speed is proportional to temperature) p = 6.67E-12 But the...
  7. J

    Year 12: Cambridge Physics Problem (Movement of Bromine gas in air)

    Bromine gas at atmospheric pressure and room temperature has a density of 6.4 kg/m3. An approximate r.m.s. speed of bromine molecules is 216.5 m/s. Experiments show that bromine molecules take about 500s to diffuse 0.1m in air. This low speed compared with the r.m.s. speed can be attributed...
  8. J

    Year 12: Cambridge Physics Problem (Distance of O atom in atmosphere)

    At an altitude of about 100km above the Earth's surface, the density and temperature of the atmosphere are about 10^-14 kg/m^3 and 2000K, respectively. At this altitude, the major constituent of the atmosphere is atomic oxygen. Use this information to estimate the pressure of the atmosphere at...
  9. J

    Year 12: Cambridge Physics Problem (Oscillatory Motion)

    By considering the forces acting on B by masses A and B, I am able to come up with the formula F=k(y+z). However by doing that I am ignoring the forces on the right, and that the formula I obtained at the end is divided by a factor of surd 2. What am I doing wrong over here? Can somebody please...
  10. J

    Year 12: Cambridge Physics Problem (Thermal System)

    Two cylinders A and C of equal volume V contain the same ideal gas at temperature T and at pressures 2p and p respectively. A valve connecting the two cylinders is opened slightly and as the gas leaks from A to B, the pressure in A is maintained at 2p by pushing in a piston. The process is...
  11. J

    Year 12: Cambridge Physics Problem (Pressure inside a vessel)

    A vessel is divided into two parts of equal volume by a partition in which there is a very small hole. Initially, each part contains gas at 300K and a low pressure, p. One part of the vessel is now heated to 600K while the other is maintained at 300K. If a steady state is established when the...
  12. J

    Year 12: Cambridge Physics Problem (Doppler effect of light in a box)

    An evacuated cubical box of side a is constructed with perfectly reflecting interior surfaces; initially, it is dark inside. A small window is opened to allow light of frequency f to enter the container and is also closed again when the box contains N photons. Suggest what might happen if the...
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