Recent content by Brendanphys

Homework Statement A plane has 3x-3z+3 = 0 as it's cartesian equation. Determine the cartesian equation of a plane that is perpendicular to this plane and contains the point P(2,9,-3) The Attempt at a Solution Since (3,0 ,-3) is the normal for the first plane, I figured it to be a dir'n...

Homework Statement A ping-pong ball, of mas3E-4kg is hanging from a light thread 1.0m long, between two vertical parallel plates 10cm (0.1m) apart. When the potential difference across the plates is 420 V, the ball comes to equilibrium 1cm (0.01m) to one side of it's original position. What...

Homework Statement This is a problem I did during a test, and I am looking it over to see what I did wrong.. 1. An Electron is accelerated by a potential difference of 75V. What is the de Broglie wavelength Homework Equations P = h/λ Ek = 1/2mv^2 eV = 1.6E-19 The Attempt at a...

Thanks a lot for the help guys... this is what I've managed to come up with thanks to all your input... I feel I'm getting close. sinθT = mg sinθ(2mg) = mg sinθ = 1/2 special triangle so... θ = 30 (next part is the part I feel is probably incorrect) Let @ be the other degree in the...

well I end up getting cosθmg for the component, but once again not sure how an unknown angle will help

Well the θ is the angle with the horizontal minus 90 degrees, because I made a triangle with a vertical line going through the object. Then I used the z pattern to find the angle the Fg makes with the radical component of Fg. This seems to be my biggest problem, I'm not sure how to solve for...

so m(V^2/r) = T + (-cosθ(2mg)) ? If that's true it seems I have too many unknowns to solve for.

So that means that the tension equals the component of gravity (2mg) in the radical direction?

I've drawn the fbd but I only see two forces acting, the tension and gravity. So the net force in the radical direction is the tension plus the radical component of gravitational force?

Alright, well after looking at that I'm a little confused as to how to solve for the angle. From what I'm getting it seems that I should break up the Fg into a component in the direction of tension F = cosθFg = cosθ(2mg). So 2cosθmg = [(v^2)/r]m 2cosθg = (v^2)/r cosθT = 2mg...

Homework Statement Here's the question: You favourite pyhsics teach who is late for class attempts to swing from the roof of a 24m high building to the bottom of an identical building using a 24m rope. She starts from rest with the rope horizontal, but the rope will break if the tension force...