Recent content by ronny45

Using Fortran 77, I'm trying write a program which will read in the coordinates of the atoms in a molecule from this input file: 21 Aspirin C 0.8641 0.1885 -0.0550 C 1.6904 1.2832 -0.0518 C 3.0579 1.1437 -0.0197 C 3.6120 -0.1296 0.0167 C 2.7571 -1.2117 0.0051 C 1.3999 -1.0697 -0.0319...

I see what you mean, I was just trying to be consistent with the units on the RHS without thinking of the quantity involved.

Homework Statement A 2 kg object hangs from a spring, the mass of which can be discounted. When the object is attached, the spring extends by 2.5cm. The top of the spring is then oscillated up and down in SHM with an amplitude of 1mm. If Q=15 for the system, find w_0 (angular frequency) and...

Okay, so the contact potential is U1+U2 - KE = 9.7 - 5.0 = 4.7eV. I got the density from the ideal gas equation, and I'm just going to use the literature value for the diameter to get the mean free path. That's cleared a lot up. Thanks for your help!

In the experiment, a heated cathode emits electrons which are sent by a driving voltage U1 towards a grid control electrode and then accelerated by the field produced by voltage U2 towards a positively charged acceleration grid electrode. Those electrons with sufficient kinetic energy to pass...

Homework Statement I've just done a practical to plot a franck-hertz curve for mercury. There are a few post-practical questions, and I'm not sure of 2 of them: 1) estimate the contact potential 2) estimate the mean free path of an electron in mercury vapour at a temperature of 160C and...

Of course... it's the radius at 55 degrees north, which is 962,461m. Centrifugal force = m (Omega)^2 r = 5.9742 × 10^24(7.27*10^-5)^2(962461) = 3.04*10^22

2pi/86400 = 7.27*10^-5m/s (7.27*10^-5)^2 *6378000*5.9742 × 10^24 kilograms (mass of earth) =2.01388*10^23 N (not sure if Newtons are the correct unit of centrifugal force) Does this seem a reasonable figure?

Centrifugal force = m (Omega)^2 r Sorry, the time it takes the Earth to rotate is one day... how would I get the rotational speed then? Is it the angular velocity?

[SOLVED] Mechanics - gravity Homework Statement A pendulum bob is suspended from a long pole at a latititude of 55 degrees north on the Earth. When the pendulum is at rest, the combined action of gravitation and Earth's rotation makes the bob deviate towards the south. By how much does the...

Thank you!

Could you please explain why?

[SOLVED] Sound Level Homework Statement If sound intensity level is reduced from 90dB to 75 dB, what is the ratio of the new sound level to the old? Homework Equations Sound Intensity Level = 10 log (I/Io) The Attempt at a Solution 10 log 90 = 1.954 10 log 75 = 1.875...

Sorry, my mistake, must read question more carefully! Thank you!

This is where I had trouble... I wasn't sure I could assume that the rays were perpendicular to the prism, since the question doesn't specifically state this.