Physics

Question on operational amplifier?

Question on operational amplifier? http://i292.photobucket.com/albums/mm37/NoM_2008/opamp.jpg What difference does the R2 on the left diagram do?
1 Answer(s) · 13 years ago

Please I need help on this resonance problem?????

A vibrating tuning fork is held over a water column with one end closed and the other open. As the water level is allowed to fall, a loud sound is heard for water levels separated by 17 cm. If the speed of sound in air is 340m/s, the frequency of the tuning fork is: the problem is some people are calculating this equal to 1000 Hz which doesn't make sense to me, but I think that is the right answer, and other people are calculating this to be 500 hz, which makes more sense to me with the concepts I learned, but I think is not the right answer, unless my solutions manual is wrong!!!!!
4 Answer(s) · 14 years ago

Physics Question: A 65 kg person is standing on a scale in an elevator. What will the scale read (in Newtons)?

if the elevator is traveling downward at a speed of 3 m/s and is slowing down at a rate of 1.2 m/s^2?
1 Answer(s) · 12 years ago

Your empty hand is not hurt when it bangs lightly against the wall.?

Why is it hurt it it does so while carrying a heavy load? Which of Newton's Law is most applicable here?
1 Answer(s) · 13 years ago

How far can a person fall and land in water and be ok?

I need to know how far the average person can fall and land in deep water and still be ok?
4 Answer(s) · 14 years ago

What are frames of reference?

I'm totally lost! what are frames of reference, (or what's the definition), and how do I use them ??
3 Answer(s) · 13 years ago

Don't ask where this came from because I haven't the slightest idea. But I am not trying to rig a craps game. In theory, is it possible that some number of dice could be placed in a cup in a precise orientation, shaken in a precise manner, and thrown with a precise velocity and come up with the same results every time. In this theoretical case, you would probably need to use a robot to control all action. Is this theoretically possible or are there just too many randomizing elements for this to work?
2 Answer(s) · 13 years ago

Why do spectral lines appear on both directions from the location of the zero-diffraction image of the slit?

Why do spectral lines appear on both directions from the location of the zero-diffraction image of the slit?
1 Answer(s) · 13 years ago