Recent content by ebola_virus

set up two retort stands to support a pulley and a pivot and arrange the apparatus as shown in the diagram attached... and I'm kinda stuck as to how to find the mass of the beam in this instance? Could you give me any starting references i can work along with; torque is involved, but i just...

I was reading on wikipedia when i stumbled through this article on paper folding which said: Paper folds can be constructed to solve square roots and cube roots; fourth-degree polynomial equations can also be solved by paper folds. The full scope of paper-folding-constructible algebraic...

er, i guess i got it hehe i got it that makes more sort of. systematic sense. using the double angle for tan thing tan [a + b] = tan (a) + tan (b) --------------- 1 - tan(a)tan(b) state that tan (a) = A tan (b) = B...

where did x and y come from agn?

a teacher wrote on the board tan-1(a) + tan-1(b) + tan-1(c) = pi [they are inverse trig functions btw, not the recipricol 1/tanx = cotx] hence prove that a + b + c = abc wow. do you have any idea where i can start? thanks. I've been uttered clueless.

A pendulum has a mass of 3-kg, a length of 2 meters and swings through a (half)arc of 21.4 degrees. What is its Amplitude to the nearest centimeter ? i don't undretand the queston; half arc? amplitude? and how would you use kinetic/potential energy change to solve this porblem? i really...

no no the distance traveled is divided by the square root of 2

I've been trying to figure this problem out for hours on end and i can't even go on the tinernet to find the answer because its hard to search for. The problem is: You start off at hte coordinate (4,0). you move up 45 degrees and the distance traveled is now divided by the square root of 2...

each of the forces as in?

i cn't tell what I am getting wrong because its an online question where i plug in the values and get answers.. and thing is i keep getting values off by like. twenty or something. what i did is, fully: (13000)(9.8) + (900)(9.8) ------- (1) then i obtained (13909)(0.41) ------- (2) added the...

There were two posts reltaed to this question but both of them are so contradictory; the question goes a 13,000kg helicopter accelerates upward at 0.41m/s^2 while lifting a 900kg car. to the nearest Newton what is the lift force exerted by the air on the rotors? now one post would be...

the question is the topic, but I am sorri i don't have any numbers i can deal with, because we're just supposed to demonstrate that we understand how we solve htese porblems. unfortunately, I don't. could anyone just give me random numbers and tell me how to olve this question? thanks. I am...

i've just been given an assigment that's related to friction and what factors affect it. The basic stuff I've managed to understand is: 1. factors that affect friction are the materials which the objects are made out of and the weight. so they're asking us to perform an experiment that...