# Recent content by Faloren

1. ### Accelerometer-based seismometer?

I mean what I said earlier. Simply taking an acceleration reading tells you nothing about the actual magnitude of the quake itself. It tells you the size of the quake at your location. Combining location and amplitude will give you a 'weighted' measurement, but that's still useless without a...
2. ### Accelerometer-based seismometer?

You'll still need to calibrate each individual device for amplitude readings. Multiple devices will let you pinpoint the location of the quake, but you still won't be able to determine how large the quake was unless you've got some previous data to give your results some context.
3. ### Programming for physics

1) It vastly depends on the area of physics you want to get into. Astronomers and astrophysicists often use a mixture of C/C++ for hydrodynamic or many-body simulations and Python for other stuff. Other researchers might use Matlab, others use visual programming languages like LabView...
4. ### Atmosphere a long time ago

Usually ice cores. Antarctic ice can be millions of years old and gases dissolved or simply trapped as bubbles in water are preserved over time. When the ice is bored out and examined, it's possible to look at the traces of different gases present - this is frequently done for carbon dioxide...
5. ### Accelerometer-based seismometer?

It's not as simple as you think. The determination of the magnitude is dependent on a number of factors, not least the distance from the hypoentre. Generally the classification is worked out by comparing readings from a number of different locations and presumably by computers which...
6. ### Earth & moon rotate round center of mass

By infinite mass, that's not entirely true - it's more like you treat the smaller object as having negligible mass, right? The idea being that if you're working out, say the orbit of the Earth about the Sun, you don't need to know the mass of the Earth because the sun's mass will dwarf it (i.e...
7. ### Earth & moon rotate round center of mass

Have you considered using Kepler's law for a rotating binary system? \Omega^2 = \frac{4\pi^2}{P^2} = \frac{G(m_1+m_2)}{R^3 } (P is the period of time it takes for the binary to orbit one another) We know that: m_1r_1=m_2r_2 , so R is defined as r_1+r_2 . r1 and r2 are the radii from the...
8. ### Induced potential in a bar due to a magnetic field

Homework Statement http://img268.imageshack.us/img268/6536/physics1.png [Broken] Homework Equations Lorentz Force = F = q(E+(v\times B)) The Attempt at a Solution i. I = \frac{dQ}{dt} So, dQ = number of electrons x area dx i.e. I = \frac{n e d^2}{dt}dx = n e d^2 v_d ii Presumably the...
9. ### Work done by a heat engine - quick issue with units used in the solution

Thanks :) Hah i really hope he didn't mark everyone down last year because of that!
10. ### Work done by a heat engine - quick issue with units used in the solution

Homework Statement "A gas storage system contains oxygen at a pressure of 5 atmospheres at 300 K. (Here, you may assume that oxygen behaves as an ideal gas.) The volume of the cylinder is initially 150 L. (State 1.) In a fire the gas is initially heated by 200 K, with a safety system keeping...
11. ### Projectile motion of a baseball

Were you not given a value for time between the ball being hit and it clearing the wall? (Although you may not need it for this question)
12. ### Ideas to extend my coursework?

Ideas to extend my coursework? (Standing Waves) Homework Statement I'm doing some coursework for school at the moment, and my chosen topic (because it was fun first time round) is standing waves on some kind of wire/string - ie vibration generator, wire and fixed end (ie pulley) with mass...