Qualification > Sciences

Circular motion question help please

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Deadly_king:

--- Quote from: winnie101 on October 22, 2010, 02:51:02 pm ---could u plz explain how  got angular velocity, i dont get it

--- End quote ---

a = R

where a = acceleration due to gravity ( for this question)
R = radius

Hence = (a/R)1/2

winnie101:
ya i got that but i dont get how for ques 3 u got w=(100*2pi)/60
plz explain Thanks

Deadly_king:

--- Quote from: winnie101 on October 24, 2010, 01:37:47 pm ---ya i got that but i dont get how for ques 3 u got w=(100*2pi)/60
plz explain Thanks

--- End quote ---

Hmm........am getting another answer. I think we need to wait for Asif to clarify his method. But am pretty sure he missed something there :-[

w = 2pie/T

T represents the period.

It has been given that the ceiling fan is turning at a rate of 100 revolutions per minute.
This implies that 100 revolutions in 60s.

The period is therefore 100/60

Hence w = 2pie/(100/60) 

cooldude:

--- Quote from: Deadly_king on October 24, 2010, 02:47:12 pm ---Hmm........am getting another answer. I think we need to wait for Asif to clarify his method. But am pretty sure he missed something there :-[

w = 2pie/T

T represents the period.

It has been given that the ceiling fan is turning at a rate of 100 revolutions per minute.
This implies that 100 revolutions in 60s.

The period is therefore 100/60

Hence w = 2pie/(100/60)  

--- End quote ---

asif's right,
let a=theta
w=da/dt
da is the change in the angle so 100 revolutions are 100*2pi radians (the change in the angle), and 1 min=60 sec
therefore w=200pi/60=10.5 rad/s

Deadly_king:

--- Quote from: cooldude on October 24, 2010, 02:59:03 pm ---asif's right,
let a=theta
w=da/dt
da is the change in the angle so 100 revolution is 100*2pi radians (the change in angle), and 1 min=60 sec
therefore w=200pi/60=10.5 rad/s
i

--- End quote ---

Ooh.........I get it dude :)

Thanks for your help ;)

+rep

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