Recent content by safat

I think so.

no, wedge has mas M, and its surface it's smooth.

Homework Statement Find the minimum μ required between wedge M and ground so that it stays static. Homework Equations I already found the equations for accelerations and tension (when μ is big). Do I need them? The Attempt at a Solution I would like to know whether I found all the...

ok, last question, and then I promise I will stop bothering you! Can you explain me why (in a broad sense) the graph is an hyperbola? Which kind of relationship there is between V_R and R to lead to an hyperbola?

edit. as I misunderstood your answer. TO recap: the graph for 1/V_R vs 1/R should give me a straight line and the graph for V_R vs R and hyperbola? Right?

Argh! You are right about the shape! It resemble a log graph actually! Many thanks for your help.

Homework Statement Homework Equations The Attempt at a Solution I got a simple circuit with an oscilloscope, a SG (with internal resistance), and a variable resistor. r and R are in series. for V_R=V_0*(R/R+r) I measured a series of R and V_R values from the oscilloscope. Now, I'm supposed to...

great. thanks for your help!

Ok, sorry for the poor quality of the sketch, but I want to be sure I understand this problem. Am I right by doing so? Thus I can find the angle between 4v and v, as the angle of impact.

Yep I got v=17.7ms-1 I am really tempted to do 17.7/4 => u=4.4ms-1, but I guess it's far too easy and sounds wrong. I have also noticed that if I put v and h as vectors nose to tail, I have 4v as a resultant vector. I am kind of sure this is the way for finding the angle of impact.

Homework Statement Classic cannon ball launched with an initial horizontal velocity from an elevated position. Initial hvelocity: v Final velocity (when hits the ground): 4v High of the cliff: 16m Find the initial velocity and the angle at which the ball strikes the ground. Homework Equations...

thanks again tiny-tim! you also provide a really efficient proof reading service! :cool: About the second part.. tbh, I have done it by guessing. But it looks like the great majority of my peers used the quadratic formula (x=-b+-(√b2-4ac)/2a) I was wondering how it could be done that way.

thanks tiny-tim. that's what I got by confrontating the original equation (for the record:3(x3-1/3x2-10/3x+8/3)=0 ) and x3-x2(a+b+c)+x(ac+bc+ab)-abc=0 1/a+1/b+1/c=(ac+bc+ab)/abc=(-10/3)/(-8/3)=5/4 About part two: should I use the quadratic formula or can I go by guessing? I got...

Homework Statement knowing a,b and c are roots 3x^3-x^2-10x+8=0 show that: 1) 1/a+1/b+1/c=5/4 2)a^2+b^2+c^2=61/9 Homework Equations factor theorem --> (x-a)(x-b)(x-c)The Attempt at a Solution can only use factor theorem: therefore (x-a)(x-b)(x-c)--> up to: x^3-x^2(a+b+c)+x(ac+bc+ab)-abc no...