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Centripetal acceleration

  • Thread starter tascja
  • Start date
87
0
1. Homework Statement
Calculate the magnitude of the centripetal acceleration at 8.4 cm from the centre of the centrifuge when it is spinning at 6.0x10^4 rpm. Express your answer in terms of g (acceleration due to Earth's gravity.)


2. Homework Equations
Ac = v^2 /
r

3. The Attempt at a Solution
I know the solution i just dont understand what they are asking from me when they say:
Express your answer in terms of g (acceleration due to Earth's gravity
 

Answers and Replies

rock.freak667
Homework Helper
6,230
31
I know the solution i just dont understand what they are asking from me when they say:
Express your answer in terms of g (acceleration due to Earth's gravity


For example if you got your answer as 19.62ms^-2 that would be the same as 2*9.81 and since 9.81 is g, the acceleration would be 2g.

So what you want to do is divide your answer by 'g' i.e. 9.81, and the resulting number would be in terms of g.
 
87
0
thank you! so if my answer was 1.5x10^14 m/s^2 it would then become 1.53x10^13g ?
 
rock.freak667
Homework Helper
6,230
31
That would be it depending on what value you use for 'g'
 
Gokul43201
Staff Emeritus
Science Advisor
Gold Member
6,987
14
thank you! so if my answer was 1.5x10^14 m/s^2 it would then become 1.53x10^13g ?
Yes, but that number is not the correct value of the acceleration.
 
87
0
Oh! its not velocity that's given its frequency
 
87
0
so the actual answer would be
Ac = 4.3x10^13 m/s^2

and in terms of g
= 4.3x10^12g
 

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