Recent content by steven george

Thanks, Maybe I'm missing something that will seem obvious once it makes sense, but when considering the acceleration shouldn't we just consider the time that the molecule is actually in contact with the wall? It really doesn't seem right to me to use the same Δt.

Homework Statement An ideal gas with molecules of mass m is contained in a cube with sides of area A. The pressure exerted by the gas on the top of the cube is P, and N molecules hit the top of the cube in a time Δt. What is the average vertical component of the velocity of the gas...

I knew there must be a simple answer. Thanks for that. Now, what if that weight is taken off by carefully lifting it straight up?

Hi everybody, I apologize if something like this has been asked before but I have been unable to find an answer through searching. If a weight is carefully added to a moving cart then the cart should slow down due to conservation of momentum. How is it that the cart has accelerated without a...

Thanks. Do you have any explanation for the discrpencies? The numbers you give would give a wavelength of 1.24 m (a little more than that when you account for end correction. That would give us a speed of under 300 m/s, which is much too low. The results with straws were much, much worse...

Thanks for your input. I'm still hoping to find out what the problem is.

I use a fantastic program called Zelscope.

If you know how much potential energy it has at the top, as you have described then just add the kinetic energy for the speed that you have already calculated. That will give you the total amount of energy. All of that energy comes from the potential energy of the spring so the total energy is...

Thanks! I had suspected that it would behave like a closed tube at the mouth end but if that was the case I would expect to see only odd numbered harmonics. We saw all the harmonics so I am still a bit puzzled by the whole thing.

I would think about using the potential energy of the spring, 1/2 kx2. That amount should be equal to the kinetic energy for the speed you need added to the gravitational potential energy for a height equal to the diameter of the loop.

I am a physics teacher and I my class is currently studying sound waves. I had my class make some noise makers with straws as shown here. http://www.physics.org/interact/physics-to-go/straw-oboes/ We measured the frequencies coming from the straws and they seem to act like a pipe open at...