Simultanious equations

[James Smithson]

The bane of my life at the moment .

Currently studying statics and I love it I feel i understand it and I can get very fan on questions but when it comes to geting it to the point of two simultanious equations im lost . I find it too confusing.

Please could I post a few and have them worked out and explained so I can try copy techniques used on here ?


where μ = 0.74
where μ=0.43
I have the answers now as it says the answer when i get them wrng but it does not show the working out for the simultanious equation part so I am stuck



thank you!
James


i should have sain g is 9.8

 

[Dr.Peterson]

I think it will be most helpful if you show your attempt at one, so we can see where you are confused, and also, perhaps, what method(s) you have learned.

One thing that may help would be to evaluate all the coefficients, so that, for example, the first equation, [imath]-\mu N+T\cos(5^\circ)-20g\sin(35^\circ)=0[/imath] becomes [imath]-0.74N+0.99619T-160.55=0[/imath].

And my first thought for solving that first system of equations is to multiply the second equation by [imath]\mu[/imath] and add them together. Then you can easily solve for T.

 

[fresh_42]

The bane of my life at the moment .

Currently studying statics and I love it I feel i understand it and I can get very fan on questions but when it comes to geting it to the point of two simultanious equations im lost . I find it too confusing.

Please could I post a few and have them worked out and explained so I can try copy techniques used on here ?


View attachment 38707 where μ = 0.74
View attachment 38708where μ=0.43
I have the answers now as it says the answer when i get them wrng but it does not show the working out for the simultanious equation part so I am stuck



thank you!
James


i should have sain g is 9.8

What do you know about matrices, especially 2x2 matrices and their inverse?