Recent content by eddyb

I have a question on axial loads. I can get to a certain point but can't quite work out how to used the forumla properly. The question is Given that the maximum compressive stress for steel is 235MN/m2. Using a factor of saftey of 3, determin the maximum axial compressive load that can be...

right thank you i know get it. doing another example now so the asked displacement is .126 m many thanks chap really do appricate your time and efforT!

so all i need to do now is rearrange the equation again to find X which is the extention ?

so now we have t is t the half, or do we work out the half from t? then rearrange another equation to produce x which is the extrention of the spring?

i got 4.29 for t=arccos(1/2)/w

i can't really read what that says does it say t = arccos(1/2)/w? i know we need to solve t but i just can't work out the fiqures to put in this is what is making me strugle from the beginning i know w is 10.47 and that's it apart form what i explained earlier either i am being stupid or just...

have i got the angular velocity and amplitude right? did i get the max velocity right then? sorry just can't quite how you find t or is t = wA/2 which would be 10.47*.145/2 ?

ah i see now because T has no effect on the velocity at which it will fall an rise! thanks so i got Vmax = 10.47 x .145 = 1.51815ms-1 and at 50% of the maxiumum velocity t = 1.15815ms-1 / 2 = 0.759075ms-1. So to find the displacement at 50 % i need to use the velocity at 50%?

ok so the equation for the velocity would be v = 10.47 x .145 x cos (10.47 x 0.6)? The amplitude i think is .145 and the angular velocity is 10.47 just can't work out what i am missing here. i think i can work out the speed at half by dividing the time by amplitude by 2?

well i thought that finding the displacement of the spring would help in find the displacement at 50% of its velocity. So i used x(t) = Xm Cos wT It is used to find the elongation (x) of the spring.. The formlua i posted a minute ago is wrong i just went threw it. I know that the time is takes...

i can't see how that helps thou i am given the amplitude motion is 145mm but i can't see how i am meant to link it. I've work out that the angular velocity is 10.47 so i used 10.47 0.0145 x cos 10.47 x 0.6 which is wACoswT which gives the velocity i got -0.052ms-1 i just catn get that intial...

i don't as the question i have been given is diffrent from all my notes usually you have mass or spring constnat (k) but i just really haven't got a clue where to start

hi i am struggling with this question as i can't work out how to approach it. I am unsure which steps i need to take to resolve it and any help would be much appricated! The question is A mass suspended from a helical spring is set vibrating and it is found that 125 complete oscillations...