Recent content by recon9

1. I am trying to figure out a problem involving a barlow lens in a telescope. All I know is that the focal length of the lens is -0.05m. I want to know where to place the barlow lens in front of the image created by the first lens (as if the barlow wasnt there) in order to get an image 3x the...

Thats for dilution. In this question I have 2 samples of the same substance each with a different volume and concentration. Those are then mixed. How do I find the total concentration of the mixture? The final volume will be the sum of the 2 volumes before, but the concentration will be...

Ok, I am trying to remember my grade 11 chem stuff cause I am helping out a friend who is taking it, but When you have 2 samples of the same chemical, different volumes and different concentrations then mix them, what formula is used to find the final concentration? is it CiVi + CiVi= CfVf ?

Ok, I am trying to help my friend with her physics homework and she is doing vectors right now. What I can't figure out is how they have the vectors written. They have it for example, N 20degrees E . What does that mean? I am use to doing them so many degrees north of east or east of north...

Ive been searching on the net and found some good sites but found nothing to help me with these questions. Could you please explain how to get the answer? 1. A spherical water tank has a radius of 15m. If water is pumped in at a rate of 10m3/minute, find how fast the level in the tank is...

Would you be able to walk me through the steps you took the get those answers? That would be great, thanks!

Hello, I am in grade 12 taking math31 which is pretty much a college course. I am not doing that great in it at the moment and I just found this forum with less than 2 months left in the semester. Anyway, there are a few questions I am stuck on. One of them is: (note: all of the '<' are...

Hello, I am in grade 12 physics and we have to make a project using electricity then explain it to a bunch of grade 5ers. Me and my friend are making a small car with tether and then a controller. We want it to be able to go forwards/backwards and turn, plus have some other gizmos on it. Our...