Math Is Fun Forum

Mark 42

Member

Registered: 2015-07-24

Posts: 4

Vectors help?

Three forces of magnitudes 30, 60 and x newton acting at a point are in equilibrium. If the angle between the first two is 60⁰, the value of x is?
a) 25√2  b) 30√3  c) 30√6  d) 30√7
How do I calculate this?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Vectors help?

Hi;

I like b.

Where the red vectors are the two forces, the black one is the resultant and the red one is the answer.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Mark 42

Member

Registered: 2015-07-24

Posts: 4

Re: Vectors help?

Thanks a lot!
But, is graphical method the only method we can follow? I mean, is there a calculative method too? Also, can you recommend some links so that i can learn to solve these type of vector problems? Because these problems are kinda based on your analytic skill rather than just formulas and concepts and I'm studying from god knows when, but still can't get these.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Vectors help?

Yes, there is a calculating way too.

http://www.physicsclassroom.com/Class/vectors/u3l3c.cfm

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Mark 42

Member

Registered: 2015-07-24

Posts: 4

Re: Vectors help?

Thank you! You're awesome!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Vectors help?

Nope I am bobbym, a bumpkin.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.