Qualification > Sciences

AS Level Physics doubt.

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Vin:

--- Quote from: Kimo Jesus on September 13, 2010, 05:18:24 pm ---yea sure you are  MR . mod not me :P

so should i post my AS questions there from now ?

--- End quote ---

Yes, that'll be better. ;)

nid404:

--- Quote from: Kimo Jesus on September 13, 2010, 04:44:01 pm ---Weird question

The linear speed ( v in m/s) of a particle moving in a circular path depends on some or all of the following properties: r is the radius of the circle , w is an angular velocity in s^-1 with which the particle orbits about the circle , and m is the mass of the particle.There are no dimensionless constants in the equation.

What does 'There are no dimensionless constants in the equation.' mean?

(a) Find formula for v
 is it just r/w?

(b) Find a formula for F , the force on a particle moving in a circle , which also depends on some or all of the above properties and also has no dimensionless constants.


Thanks in advanced

ps: If anyone can tell me what topic is this? Homogeneity?

--- End quote ---

a)v=rw
b) F= mv2/r

WARRIOR:

--- Quote from: Garfield on September 13, 2010, 05:32:42 pm ---a)v=rw
b) F= mv2/r


--- End quote ---

can you explain the answers?

nid404:

--- Quote from: Kimo Jesus on September 13, 2010, 05:41:18 pm ---can you explain the answers?

--- End quote ---

yeah :P



angular velocity w= /t

s= r

s=vt

v=s/t

v= r/ t

/ t=w

v=rw

nid404:
a= dv/dt

if theta is small, the dv/v=ds/r

ds=vdt=rd  & dv=vd

dv/v= vdt/r

dv=v2dt/r

dv/dt= v2/r

a=v2/r

F=ma
F=mv2/r

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