||Homework Help||Kindergarten-University. - Page 46

Thanks so much akhl with those math questions, hope you had a happy new year :)

I need help with this socials question, I actually suck at demographics and stuff, so I need help please.

Picture u to open a sports store. what demographic info would you want to know about your target market? How would you use the info to choose type of sports products you would hope to sell?

Physics:

As an object is moved closer to a converging mirror, what regular changes occur in the size of the image, the distance of the image, and the attitude of the image?

Is the attitude inverted? I don't really get this:\

Where would you place an object, relative to the principal focus, in order to form a real image? A virtual image?

Transverse and longitudinal waves

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

I think its the small diameter spring, not sure and don't really know why, I've just observed it, is it because the diameter is smaller?

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

I think it's also the small spring, but not sure why.

3. Does the amplitude of the waves affect their speed through the spring?

Not sure, but I don't think it does.

4. Does spring tension affect wave speed? Explain.

Yes, It does, when we stretch it out, they travel faster?

5. When a wave travels though the medium(the spring), does the medium travel or just the disturbance in the medium?

Not sure, I said that only the disturbance because it stays in our hands, only waves side to side with the wave.

6. When a wave reflects from a fixed end of the medium, does a crest reflect as a crest or is it reflected as a trough? In other words is the wave inverted?

I think Yeah. The wave was originally positive, and it reflects as negative.

Originally posted by: -Ayeshaa-

Physics:

As an object is moved closer to a converging mirror, what regular changes occur in the size of the image, the distance of the image, and the attitude of the image?

Is the attitude inverted? I don't really get this:\

Where would you place an object, relative to the principal focus, in order to form a real image? A virtual image?

A lamp is moved from 30cm to 90cm above the pages of a book. Compare the illumination before and after the lamp is moved.

^ Is there a certain formula to figure that out? Teacher never really talked about this topic.

Originally posted by: -Ayeshaa-

A lamp is moved from 30cm to 90cm above the pages of a book. Compare the illumination before and after the lamp is moved.

^ Is there a certain formula to figure that out? Teacher never really talked about this topic.

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