Recent content by a150daysflood

Hi, from what I know, the crushing force for sugar cane is somewhat similar to pine wood which is about 40 MPA. But since there's water content in it, I need to readjust the yield stress for to crush the sugarcane. I've tried googling it but couldn't find much useful information. Anyone knows...

Homework Statement Find the ODE of the following (1) du/dy = -u (2) d^2u/dxdy = -du/dx Homework Equations For question 1, the answer is u= A(x)e^(-y) while for question 2, the answer is u= e^(-y)(B(X) + c(Y)) The Attempt at a Solution I've already solved the question, but...

Hi, how do I go abt finding the force by rod on the slider in part(iii)?

If it doesn't move, I assume the centripetal force= the static friction Which is (cos30)mrw^2= (0.2)(sin60)9.81 But this doesn't give me the answer given which is 4.07rad/s. Can highlight where did I go wrong?

Homework Statement [PLAIN]http://img687.imageshack.us/img687/5055/imagelrl.jpg Homework Equations Static friction = (9.81sin60 x 0.2)N Centripetal force = mr(w)² The Attempt at a Solution I am only abl to get part (i), need hints for part (ii) and (iii). Thanks in advanced

Homework Statement A pendulum is constructed from a fixed length of light thread and and a spherical,low density,polystyrene bob.It is forced to oscillate at a different frequencies in air,and the response is shown in the graph below. Homework Equations The Attempt at a Solution This is the...

Homework Statement A body of mass m is accelerated uniformly from rest to speed v in time T. The instantaneous power delivered to the body as a function of time is given by? Homework Equations P=w/t e=1/2mv^2 The Attempt at a Solution P=w/t P=[0.5m(v/T)^2 ] /t p=(mv^2) /...

yea i copied it word for word.

one of my problems for my physics olympiad training,i can't seem to solve any of them on my own probably due to lack of knowledge about calculus. i only learned c mathematics and not further mathematics.i have to read up on dot product for this question. anyone interesting in teaching some other...

So, B( 2 x 7^(0.5) x cos(30) , 2 x 7^(0.5) x sin(30) -9.81t ) A( 7^(0.5) x cos(30) , 7^(0.5) x sin(30) -9.81t ) When i use dot product,i get this : 21/2 + 7/2 -26.0t - 13.0t + 96.2t² = 0 96.2t² - 39.0t + 14 = 0 I can't solve this equation,where did i went wrong? Anyone please correct...

okay thanks :)

Because cos(90) is zero thus their dot product is zero right? by the way,any website that can help in explaining how to derive the velocity as a function of time? Thanks a lot.

Can you explain slightly more? I still don't quite understand. if i set the dot product to 0,isn't it the maximum point? thanks for helping

Homework Statement Two particles A and B are projected from the same point O with angle speed 30degree from the horizontal. If A has the speed of projection equal to (7)^0.5m/s and B has twice the projection speed,find the separation between them,when their velocities are mutually perpendicular...

1. Homework Statement The standard enthalpy change of combustion of propane (C3H8) is -2220kJ/mol. It requires 1.0J of energy to raise the temperature of 1.0g of air by 1.0K. Calculate what mass of propane needs to be burned to raise the temperature of the air in the balloon by 50K. 2...