rvc
  • rvc
Hey please help me guys...
Physics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
rvc
  • rvc
im solving old university question papers.. for the verification of answers n doubts i require your help ....
rvc
  • rvc
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IrishBoy123
  • IrishBoy123
gotcha which one you doing, all of them?

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rvc
  • rvc
yep all this is just question 1 thank you so much sir :) this help of yours will surely bring a lot of difference in my understanding of mechanics in particular since im not so good at it. :)
IrishBoy123
  • IrishBoy123
|dw:1447165187900:dw| assuming frictionless wall
rvc
  • rvc
i got T as 11.547N
IrishBoy123
  • IrishBoy123
yeah ihttp://www.wolframalpha.com/input/?i=10%2F+sin%2860%29 soz, i haven't got a proper calculator
rvc
  • rvc
i applied lami's theorem here |dw:1447165361043:dw|
IrishBoy123
  • IrishBoy123
i don't know what lami is, would need to look it up.... |dw:1447165525622:dw| i would just resolve in x direction: \(R - T \cos (60) = 0\)
IrishBoy123
  • IrishBoy123
ah, Lami: \[\frac{A}{\sin \alpha}=\frac{B}{\sin \beta}=\frac{C}{\sin \gamma}\] could do that i suppose....
rvc
  • rvc
yep what did you get the answer as?
IrishBoy123
  • IrishBoy123
http://www.wolframalpha.com/input/?i=+cos%2860%29+*+10%2F+sin%2860%29
IrishBoy123
  • IrishBoy123
\( 10 / \sqrt{3} \)
rvc
  • rvc
hmmm its different
rvc
  • rvc
how did u get cos?
IrishBoy123
  • IrishBoy123
|dw:1447165867289:dw| \(R - T \cos (60) = 0\) \(\implies R = \dfrac{W}{\sin (60)} . \cos (60) \)
rvc
  • rvc
|dw:1447166144735:dw|
rvc
  • rvc
hmm |dw:1447166267615:dw|
IrishBoy123
  • IrishBoy123
http://www.wolframalpha.com/input/?i=10*sin%28150%29+%2F+sin%28120%29
IrishBoy123
  • IrishBoy123
same answer ie \[\dfrac{T}{\sin (90)} = \dfrac{R}{\sin (150)} = \dfrac{10}{\sin (120)}\]
rvc
  • rvc
150?
IrishBoy123
  • IrishBoy123
|dw:1447166630689:dw|
rvc
  • rvc
oh okay got it ty 1 d) n 1 e)
IrishBoy123
  • IrishBoy123
1 d) |dw:1447166827568:dw|
IrishBoy123
  • IrishBoy123
that's (i) & (ii)
rvc
  • rvc
yep
IrishBoy123
  • IrishBoy123
|dw:1447166911099:dw|
IrishBoy123
  • IrishBoy123
in terms of the words, well i hate wordy questions, especially when a drawing is an awful lot more powerful....
rvc
  • rvc
yep i understand :) yes this answer was correct of mine however i m struggling with the next one
IrishBoy123
  • IrishBoy123
e?
IrishBoy123
  • IrishBoy123
this is a v-t graph. the area under the graph gives the displacement, in this case the distance travelled by the plane. so you can add them up to help create the s-t graph |dw:1447167306987:dw|
mathmate
  • mathmate
ok, are we still on the centroid problem?
rvc
  • rvc
yep
mathmate
  • mathmate
I'll give a simple example of compound areas, ok?
rvc
  • rvc
yep with the rotating stuff
mathmate
  • mathmate
I'll start with something really simple, and then we'll work on the rotation. The idea of finding centroid of multiple areas is relatively simple. You would take moments about the x-axis of each area, add them up, and divide by the total area. In math terms, it would be \(\Large xbar = \frac{\sum (Ax)}{\sum(A)}\)
mathmate
  • mathmate
* about y-axis Does that look familiar to you?
rvc
  • rvc
yep similarly we have for y co-ordinate of centroid
mathmate
  • mathmate
Exactly! Would you like to work on this one? |dw:1447214876953:dw|
mathmate
  • mathmate
|dw:1447214987394:dw|
rvc
  • rvc
sure :)
mathmate
  • mathmate
Go ahead, I'll watch.
rvc
  • rvc
bigger rectangle : A =8 x=2 y = 1 smaller rect : A =4 x= 1 y = 3 summation Ax= 20 , Ay= 20 X = 6.667, Y =5 X,Y(6.667,5) units well since the units are not mentioned i did not consider any units
mathmate
  • mathmate
Excellent, so we'll now tackle the other one. I'll redraw the figure.
mathmate
  • mathmate
|dw:1447215425315:dw|
mathmate
  • mathmate
so far so good? can you now calculate theta and phi (we need only the sum).
mathmate
  • mathmate
|dw:1447215537063:dw|
rvc
  • rvc
theta = 36.8698 phi =5?
rvc
  • rvc
sorry
rvc
  • rvc
one sec pls
mathmate
  • mathmate
|dw:1447215594219:dw|
rvc
  • rvc
phi is 2.7158?
mathmate
  • mathmate
I have theta=36.86990 phi=59.86691 Do you agree?
rvc
  • rvc
i agree with theta but not with phi :(
mathmate
  • mathmate
Sorry, that would be the sum, phi=22.99701
rvc
  • rvc
nope 2.715?
mathmate
  • mathmate
phi is atan(1.06103/2.5), do you agree?
rvc
  • rvc
yesss
rvc
  • rvc
well i gt 2.715
mathmate
  • mathmate
You forgot the parenthesis for atan! lol
rvc
  • rvc
ohh i gt u sorry i thought u r considering lenght lol
rvc
  • rvc
22.9963?
mathmate
  • mathmate
ok, length is 2.71584, yes.
mathmate
  • mathmate
We need the length and (phi+theta) in order to calculate x' and y'.
mathmate
  • mathmate
Actually I should rename them x2, y2. And the one for the triangle x1,y1.
mathmate
  • mathmate
still there?
rvc
  • rvc
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