Recent content by team31

when u=-0.6i+0.8j, Du f(1,2)=? gradient f=(18,9) I use unit vector dot (-0.6,0.8) dotted with the gradient f, which turns out to be -3.6 so here is the question. A: the maximum value of Dv f(1,2) is=? B: this maximum occurs when v=(?,?) I'm confued with the Dv thing. For my guess is that I...

Nevermind, I was finally figure out that cos is in radians and sin was in degree. Now my graph matches with my predictions. Thanks anyway

I'm having trouble with the interference of sound. As the given function of the combined Amplidude A=2Acos(PI*d*sin(θ)/λ), hence the interfernce max will be d*sin(θ)=n*λ, and min will be d*sin(θ)=(n+1/2)*λ. I chose my sound frequency and wavelength. so I figule out the nth max and nth min, but...

so is that the graviational force between the tow mass is counted as part of the tension

Two point-lie objects, each with mass m, are connected by a massless rope of length l. The objects are suspened vertically near the surface of Earth, so that one object is hanging below the other. Then the objects are released. How can I find the tension in the rope? I know there 3 force...

could anybody give me a hint on my question #2, please

huh, i got it, 4r/3pi is my answer, is that right?

Find the center of mass of a homogeneous semicircular plate, let R be the radius of the circle. I have think I need to use ingergration to slove this problem, I'm stuck with that R is also changing as if I'm cutting little slices, so does that mean i have to set up two intergra, one for R solve...

I got it. thanks andrevh. Maybe I didn't express the question right. there was a graph, it would be much easier to understand. but thanks for your help anyway (vaishakh, hootenanny)

Hi guys, I have a Homework problem that is related to Projectile Motion. It is said a projectile is fired form a surface(level ground) at an angle A, above the horizonal. so here is the question, there is another angle B, which reachs the same Max high with angel A, how can I prove that...