||Homework Help||Kindergarten-University. - Page 47

1. In which spring do the transverse waves travel faster? The small diameter spring or the slinky?

The small spring because the wavelengths are short.

2. In which spring do the longitudinal waves travel faster?

The small spring because the amplitude is small, so they can travel faster.

Originally posted by: -Ayeshaa-

The law of superposition, I really don't get how to draw the waves, I think its pretty simple math calculations but I really don't get it :\ http://img209.imageshack.us/img209/4166/scan0001vi.jpg

Question about India for Socials

I have to name some problems related to India with education. What the problems are and what are the successes. The only problems Ive got are that literacy rate is low, delays in marriages, dowries, poverty, and successes that some Indians are employed at call centers.

Originally posted by: akhl

Pick some points on x axis (the more the better). At each of those points, find y coordinates of both the waves and add them. Note that above x axis means y coordinate is positive and below x axis means it is negative. The value you get on adding them will be the y coordinate of the superposition wave. Plot that point. Join all the points u get now by hand by a smooth curve.

Oh my gosh you make perfect sense man! I asked my friend for help like so many times on this and have no idea what she was saying, thanks soo very much Akhl :)

I tried re-answering the first 2 waves questions last page, still struggling...

Converging Lens

If focal lengths are measured for both sides of the lens, how do they compare?

I'm thinking they are the same for both sides, but why is it?

As object moves nearer to lens, what usual changes occur in size of image? Distance of image? Attitude of image?

Size of the image gets bigger the more we move object closer to lens. Distance of image increases, and attitude of image is inverted.

What distance is it difficult but not impossible to locate a clearly focused image?

Would that be beyond the focal point?

Where would you put an object in relation to principal focus to form real image? Virtual image?

At 2F for real image? Close to focal point for virtual image?

Converging Mirror

At what image distance is it hard but not impossible to locate a clearly focused image?

Would this also be beyond the focal point?

Originally posted by: -Ayeshaa-

Converging Mirror

At what image distance is it hard but not impossible to locate a clearly focused image?

Would this also be beyond the focal point?

Originally posted by: akhl

What image distance? You mean what object distance? The answer is "near focal point".

This is because exactly at focal point, the image does not form. So near focal point, it is difficult but not impossible to see an image.