Recent content by FelicitaH

So. 1=100/(4*pi*r^2) 4*pi*r^2=100 r^2=100/(4*pi) r= Sq. root (100/(4*pi) = 2.823 m You guys have been really helpful and I'm actually understanding the problems more so I did before. I just wish I had found this site earlier in the semester... it probably would have helped my grade -- a...

TWO questions! Distance to exp. 120dB AND Depth of Well I've got two questions here. I've worked on both of them, and now I'm stuck... 1)A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.60 s later. Find the depth of the well if the air temperature is...

Yeah, it's not right. I tried that answer earlier. Apparently it's too small.

I just assumed I could consider the boat a wave. Not sure why. So -- 1.4 + 3.2 = 4.6/22 = .2091 Is that correct then? I only have one more chance to answer this question correctly, which I why I'd just like to make sure, if that's possible. *EDIT* Actually, that's wrong. That was an...

Duh. Yes. Thank you! 5.763 :) I feel stupid. Now that seems like a REALLY simple problem.

Ok. It would be hit at a greater frequency, so I should add instead of substracting? That confuses me... because I thought that if two waves were moving toward each other it was destructive (or something like that) and so you would subtract from one another. At least, that's how I understood...

Well. That's simple. I think the whole time I just wasn't reading "approximately equal to one wavelength.." So, 340 m/s * 1,000 = 340,000 mm/s / 59 kHz = 5,762. I've got to be doing something wrong/missing a step.

There are two parts to this question. I got the first part and thought the second would be relatively easy to answer, but I keep getting it wrong: Ocean waves are traveling to the east at 3.2 m/s with a distance of 22m between crests. a) With what frequency do the waves hit the front of...

I've looked throughout my book for the formula, and I've looked online to see if there were similar problems so I could figure out how to do this, but I can't find anything. ** A bat can detect small objects, such as insects, whose size is approx. equal to one wavelength of the sound the bat...