Recent content by ranger275

Thanks for all the responses. This site is a great resource for a physics teacher.

Does that mean I could assume the pressure inside a balloon is 1 atm all the time and get essentially the correct answer?

Here is an example. Krusty, a clown, carries a 2.00 x 10-3 m3 helium filled Mylar balloon from the 295 K heated circus tent to the cold outdoors, where the temperature is 273 K. How much does the volume of the balloon decrease?

I am teaching Physics and I'm not looking for help for a particular homework problem but on a class. Sorry if this should be in the homework sections. When I park my car where the sun only hits one side and measure my tire pressure later I find the tires on the sun side have a higher...

Thanks! I am teaching the second semester of Physics for the first time and I thought that was how it worked but I needed confirmation.

If I have an atom with energy levels of -4 ev, -2 ev -1 ev and 0 ev and I radiate it with photons which cover a continuous range from 0 to 2 ev is it not possible for a 2 ev photon to move the electron from -4 to -2 and then a 1 ev photon to move it from -2 to -1 and then a 2 ev photon to free...

Thank you for all the comments. The video did clearly show the change in refraction as you changed wavelength.

If I send a single wave toward a corner won't it bend around the corner? If so, how does the wavelength of that single wave (is wavelength defined for a single wave?) effect how much it bends? Every picture/illustration I have found on diffraction shows a series of lines (plane waves)...

Thanks for all of the help. I think the launcher just doesn't covert the potential spring energy into kinetic energy very efficiently. Thanks again, especially Simon.

I had not thought of the mass of the plug. My actual height was 0.43 so it was a little more than half of my predicted height. The plug would have to have a mass of 0.173 kg to make that much difference (U(stored in spring)-U(gravity at max height from launcher)=U(gravity change in launcher)...

Lab issue -- Please check my projectile launcher calculations I am making a lab for a class I teach and my results aren't working out and I need another pair of eyes to see if my method is wrong (I apologize if this should go in homework, but it isn't a homework question so I thought it should...

I will do the plot but for your info I've attached the data and put it below. The gsinθ/2d was .071 for this run. I'm going to bring a level in tomorrow to see if there is enough of a dip to cause a problem. Thanks for the help! d t 5.2 1 22.5 2 55.4 3 46.8 4 149.0 5 201.0 5.77

I still have some of the video. I will see if I can do that. Thanks!

X R K X/R Black Disk 0 76.5 0.50 0.00 TP Large 9.25 72 0.64 0.13 0.02 TP Small 8 55.5 0.65 0.14 0.02 Silver Ring 72 74 0.91 0.97 Masking Tape 38.5 51.8 0.91 0.74 Duct Tape 38.5 57.5 0.94 0.67 Small Masking 39.5 45.5 1.02 0.87 Small Duct Tape 38.5 41.5 1.18 0.93...

When we do the lab with a solid disk we get a K of 1/2 like we are supposed to and when we use a metal ring we get a K of .91 which is believable because the thickness of the ring is about 5% of the radius. If my equations are a factor of four off then my lab results are even worse than I...