Recent content by BDR

1. Angle between colors - dispersion

Here is what i'm doing! Yellow: 1.492sin(30) = 1.000293sinθ Green: 1.493sin(30) = 1.000293sinθ When I do the calculations i am not getting the correct. The answer is suppose to be 0.043 degrees and 1.33 m. Where do you think I am messing up the calculations?
2. Angle between colors - dispersion

(a) A narrow beam of light containing yellow (660nm) and green (550nm) wavelengths goes from polystyrene to air, striking the surface at a 30 degree incident angle. What is the angle between the colors when they emerge? (b) How far would they have to travel to be separated by 1.00 mm? I need...
3. Simple Harmonic Motion of skydiver

I'm getting an answer of 2.5, is that correct? The correct answer is 1.94 s, or thats what the book says.
4. Simple Harmonic Motion of skydiver

I'm not sure that is the correct number i got for K, i have so many numbers on my paper everything is mixed together. I took the period given which was 1.5 divided by 2 pie 1.5/2pie = .239. Then i squared to get rid of the square root. Which gave me .239 = m/k. Then multiplied by k and divided.
5. Simple Harmonic Motion of skydiver

I got k = 38.14 I don't know if its right though
6. Simple Harmonic Motion of skydiver

I can't seem to get the right answer, where is my mistake? A 90 kg skydiver hanging from a parachute bounces up and down with a period of 1.5 seconds. What is the new period of oscillation when a second skydiver, whose mass is 60 kg, hangs from the legs of the first? I am using the...
7. EMF and Terminal Voltage

Thanks for the help, its greatly appreciated!!
8. EMF and Terminal Voltage

Is this what you mean.....I1 - I2 would be negative, causing a +2/5...right?
9. EMF and Terminal Voltage

Lets see if i understand: -2 V = 5r......r = -2/5??
10. EMF and Terminal Voltage

The E's would cancel each other out? But it seems to me there are more variables than numbers for this problem.
11. EMF and Terminal Voltage

I'm sorry, but I guess I am not understanding about how I get the information from the graph. Since E and r are unknown constants; does that mean that I could leave them out of the equation and just have V = I? Or am i making it harder than it really is? Is this close? 2V = E - (5 A)r
12. EMF and Terminal Voltage

I know that the internal resistance of a voltage source affects the output voltage when a current flows. I was thinking that I would use the equation V = E - Ir...but I seem to get a different answer each time I use it. I also know that V = IR. Im my view of this problem I do not have enough...
13. EMF and Terminal Voltage

Hello everyone! I have a question and any help would be appreciated! (a) What is the internal resistance of a voltage source if its terminal voltage drops by 2.00 V when the current supplied increases by 5.00 A? (b) Can the emf of the voltage source be found with the information supplied?