# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2014-05-11 16:50:19

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 1,062

### velocity

a particle is moving on a circular path with constant speed v.Find the change in velocity when it moves through 120°?

friendship is tan 90°.

Offline

## #2 2014-05-11 17:43:26

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,962
Website

### Re: velocity

Change in velocity? Do you mean instantenous acceleration or average?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

Offline

## #3 2014-05-11 19:45:03

Bob
Registered: 2010-06-20
Posts: 9,128

### Re: velocity

hi Niharika

Diagram below.  What is not clear to me is how you are supposed to express this.  (in terms of what coordinate system).

If I had this problem and no more information I would call the original vector V1 =  v.i   where i is a unit vector in that direction.  Then find V2 in terms of i and j.

Bob

ps.  Looking again at the diagram, it would probably have been better if I had put V1 going the other way so it is positive i, but too late.  I'm sure you can re-jig it yourself.

Last edited by Bob (2014-05-11 19:46:42)

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Offline

## #4 2014-05-12 18:38:30

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 1,062

### Re: velocity

yes, I got it.
thanks

friendship is tan 90°.

Offline