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AS Level Physics doubt.

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WARRIOR:
wow man im shocked. thanks alot i owe you. Ill plus rep you later , but just one more thing, what does dimensionless constants mean?

nid404:
dimensionless would be something immeasurable. So what they're saying is the constants would be well defined.

WARRIOR:

--- Quote from: Garfield on September 13, 2010, 06:17:07 pm ---dimensionless would be something immeasurable. So what they're saying is the constants would be well defined.

--- End quote ---
i see, thanks. i have a lot of studying to do !

WARRIOR:
i asked my physisc teacher and this is what i got , and it works !

We know that the unit of V = ms^(-1)

Also you have to know what angular velocity (w) is.w = radian per second ( rad s^-1)
 form wiki the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute

if you dont know whats a radian (its very easy )  , follow this link : http://www.wisc-online.com/objects/ViewObject.aspx?ID=tmh1301

Radian is an angle ( 57.2 ) , angle has no UNITS. so in question it said no dimensionless quantities in equation! and angles have no unites therefore it is dimensionless and so the unit for angular velocity is just s^(-1)

and Lets go back to question of homogenity

V= ms^(-1)

and we have radius = m and angular velocty = s^(-1)

so to creat a formula that will be homogenous


V= r x w  easier than it seems right?? ( so much xplanation was just for radian )

Part 2 of question

F = kgxms^(-2)


so we know the unit of M is KG , the unit of R= m , and the unit of w = s^-1

so F= m x r xw^2

all about homogeneity

i just have to check the 2nd answer with NID, ( garfield )

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