Turn on thread page Beta

Need help with maths calculations - anyone good at maths? watch

1. The centrifugal force, gmax can be obtained from the following formula:

gmax = 1.12 r (RPM/1000)2 where r = radius of rotation in mm, RPM = revolutions per minute

Use this equation to determine at which speed in RPM the centrifuge must be run to obtain
12,000g when r = 8.0 cm. Show the workings of your calculation below:

This is how I worked it out but dont know if its right?
r= 8.0cm (8.0 x 10) = 80mm

gmax (12000g) = 1.12 x 80 x (RPM/1000)^2

12000G/1.12 x 80 x 1000 = 365.9625274

RPM = 366 revolution per minute
2. I think you have mixed up your nemerators and denominators in the process of using a calculator - the method below shows the correct way to do it and gives an answer of 11580 revs/min (ANSWER)

Turn on thread page Beta

Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 11, 2018
Today on TSR

Summer Bucket List is Back!

Start yours and you could win £150!

GCSE Physics Equations sheet!

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE