Recent content by bllnsr

Thanks for the help

tan\theta = f_y/F_x 76.51(i didn't use minus sign in f_y) 180-76.51= 103.48 right?

so after doing Fx=-6000cos(60°)+2000cos(45°) resultant force is 6797.915 correct?

Homework Statement Homework Equations F = \sqrt{F_x^2 + F_y^2} tan\theta = F_y / F_x The Attempt at a Solution Page 1 : http://i49.tinypic.com/vfw74k.jpg Page 2 : http://i50.tinypic.com/2qspamr.jpg Page 3 : http://i49.tinypic.com/24zgl6x.jpg is it correct?

@HallsofIvy sorry for that next time I will post my full attempt.

Thanks

@Dick can you please show me last two steps of how to solve it for a

somebody told me this general formula T_{r+1} = \binom{n}{r}a^n b^r will be used to find 'a' and the statement "the coefficient of the term in x is zero" means that \binom{n}{r} is 0 and what I did previously is wrong. I have math exam tomorrow and this is the only question that I cannot solve

oh yes -1/0 is -∞ but I made it zero:frown: a/3 +1 = -1/2x putting x = 0 a/3 +1 = -1/2(0) a/3 +1 = -1/0 -1/0 is -∞ a/3 +1 = -∞ if a = -3 is the correct answer how to get this value :confused:

Homework Statement http://i47.tinypic.com/29o3ehc.png Homework Equations (1+x)^n=[1+nx/1!+(n)(n-1)x^2/2!+...+b^n] The Attempt at a Solution here's my attempt to part (i) http://i47.tinypic.com/2yv6y3s.png is it correct?

ok I got it and thanks for help everyone

Q3: 12!/7!*4!=3960 correct?

@Michael Redei Q3: 1 red box + 4 identical blue mugs + 7 identical yellow mugs = 12! and there are 3 mugs in the red box so it should be 12!*3!

Q2: There are 6 different plastic mugs and 3 different china mugs to be placed in a row where no two china mugs are adjacent. Place the 6 plastic mugs in row, inserting spaces before, after and between them. _x_x_x_x_x_x_ There are 6! arrangements of the 6 plastic mugs. Choose 3 of...

Ok so Q1(b) should be 7C3*5C2=350 ways right?