Recent content by paul11

Homework Statement Three identical small Styrofoam balls (m = 1.95 g) are suspended from a fixed point by three nonconducting threads, each with a length of 52.1 cm and with negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 28.3 cm. What is the common...

ah thank you, I need to read it more clearly.

Homework Statement A uniform plank of length 5.0 m and weight 212 N rests horizontally on two supports, with d = 1.41 m of the plank hanging over the right support. To what distance, x, can a person who weighs 433 N walk on the overhanging part of the plank before it just begins to tip...

This time, I'll use W = ∫Fdx I find the integral of F, then I get a value of -9.375 for the area under the curve from x = 0 to x = 0.5 therefore ... W = -9.375J I'm not sure how to interpret the negative value, but I assume I just use the magnitude of it, and this all gets turned to...

By conservation of energy, all the spring potential turns to kinetic. 0.5cx^2 = 0.5mv^2 The c constant is given in N/m^3 though, and I don't how to convert that to N/m if it's possible. I try to do that anyways and get a wrong value of v = 7.071, which is by coincidence (?) what I got...

Homework Statement This was a question on my 2nd midterm that I am still curious about. An unusual spring has a force law given by F = -cx^3 where x is in meters, F is in Newton's, and c has units of N/m^3. The spring is used to launch a 3.00 kg block across a horizontal frictionless...

Homework Statement A sphere of mass M=6.85 kg is supported by a string that passes over a light horizontal rod of length L=0.73 m. Given that the angle is θ=22.3° and that the fundamental frequency of standing waves in the section of the string above the horizontal rod is f=246 Hz...