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Babynini
 one year ago
Magnitudes and directions of vectors.
Babynini
 one year ago
Magnitudes and directions of vectors.

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Babynini
 one year ago
Best ResponseYou've already chosen the best response.1The magnitudes and directions of two forces acting at a point p are given. Approximate the magnitude and direction of the resultant vector, accurate to two decimal places a) 5.00lb, 200 degrees b) 7.00lb, 65 degrees.

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1@jim_thompson5910 :P can we do this one?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433465574025:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433465584644:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433465617485:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433465663391:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1find the component <x,y> form of each vector then you can add up the vectors componentwise

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1x = r*cos(theta) y = r*sin(theta)

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1Where do I derive the r from?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1r = distance from origin to vector tip r = magnitude of vector (ie force applied)

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1so 5 for part a a) would be 5cos(200) 5sin(200) ?

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1and when I add those up I get = <1.74,4.63>

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1they want it "accurate to two decimal places"

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1...that's what I did o.0

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1oh, I didn't do a and b accurate to two decimal places but that's because that's part of the process to get to the final answer and should be more accurate I think (hence more decimal places) but the final answer is ok, yeah?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1hmm maybe they just want the final answer to 2 decimal places, the steps just leave it to 15 or so (let the calculator handle it)

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1haha k. final answer looks good though? :)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yes it looks perfect. I'm getting the same

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1they don't want the <x,y> form of the resultant they want the "magnitude and direction of the resultant vector"

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1r = magnitude theta = direction r = sqrt(x^2 + y^2) theta = arctan(y/x) will give you the angle, but it will say some angle in Q4. Add on 180 degrees to move the angle to Q2 <x,y> = <1.74,4.63> is in Q2

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1dw:1433466781150:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1nvm, my drawing is way off and not to scale

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1the "7 lb" vector should be longer, that's probably why

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I'm getting roughly the same theta

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1haha yeah just a little disproportional xD

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1have you been rounding? I have been using calculator storages

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I got 110.581677969387

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1So final answer is The magnitude : 4.95 The direction = 110.58

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1Fantastic! I like this question better than the car one heh

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yeah much easier
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