Recent content by AnnieF

Homework Statement Use Equation (1) to derive the formula: (1-a*cos(phi))/(1-2*a*cos(phi)+a^2))= 1+a*cos(phi)+a^2(cos(2phi))+a^3(cos(3phi))... Homework Equations Equation (1) is 1/(1-a(cos(phi)+isin(phi)))= 1+ [a(cos(phi)+isin(phi)]+ [a(cos(phi)+isin(phi)]^2 +...

Homework Statement If (the integral from -3 to 2)f(x)dx=-1, (the integral from -1 to 5)f(x)dx=8, and (the integral from -3 to 5) f(x)dx=6, then (the integral from -1 to 2)f(x)dx= ? Homework Equations This is the part I'm struggling with. The Attempt at a Solution I...

Homework Statement ∫r^3/(4+r^2)^(1/2) dr Homework Equations ∫udv=uv-∫vdu The Attempt at a Solution I know that integration by parts must be used. I tried doing it with 4+r^2 as u, but kept running into issues..then I got an answer but it appears to be wrong. I guess I am not sure...

I need to write about this experiment. I don't quite understand what is going on in most of it; it is written a little above my knowledge level. Can anyone semi translate what it is trying to say? Especially the areas of information around the figures. Thanks in advance...

Well I was thinking that it would have to be down, because the force of tension is greater than the force of gravity, so in order for the system to be not moving, the other force would have to pull downwards in order to cancel out the larger force of tension. Is this right?

Homework Statement A point charge of mass 0.210 kg, and net charge +0.340*10^-6C, hangs at rest at the end of an insulating string above a large sheet of charge. The horizontal sheet of uniform charge creates a uniform vertical electric field in the vicinity of the point charge. The tension...

WOOOO HOOO! I did it right and I got 100 on my test! What an amazing day. :)

Thanks. I was going to do it like that but my mind was convinced that it had to be more difficult than that.

Homework Statement A 500 g block is released from rest and slides down a frictionless track that begins 2.00 m above the horizontal. At the bottom of the track, where the surface is horizontal, the block strikes and sticks to a light spring with a spring stiffness constant 20.0 N/m. Find the...

Thanks everyone. I have a big decision to make and I feel that you guys have given me more options to think about. Also, I would like to say that I am positive that I will not regret a choice in physics, but rather I will regret NOT choosing pharmacy. I have no doubt that I want to study physics...

I'm going to college next year and I am having a really hard time choosing what to do. I really love physics. It is my passion and I am really good at it. I want to major in physics, but I know getting a lucrative job in that area is not going to be easy. I have been poor my whole life and I...

Thank you for the correction on part b. I understand the mistake. On part C, however, I am still slightly confused. I understand the part about the kinetic energy being the same after sliding up, stopping and sliding back down as it was after the collision, but I don't understand the second...

Homework Statement A block of mass m=2.2 kg slides down a 30 degree incline which is 3.6 m high. At the bottom, it strikes a block of mass M=7 kg which is at rest on a horizontal surface. If the collision is elastic, and friction can be ignored, determine (a) the speeds of the two blocks after...