You are Here: Home >< A-levels

1. What is the angular momentum of a uniform rod of mass m=5kg and length l=3m rotating about its centre of mass with angular speed ω=10rads?

The correct answer should be 37.5kgm2s−1 but I'm not getting that...

Thanks
2. (Original post by Jas1947)
What is the angular momentum of a uniform rod of mass m=5kg and length l=3m rotating about its centre of mass with angular speed ω=10rads?

The correct answer should be 37.5kgm2s−1 but I'm not getting that...

Thanks
First, we use the fact that the moment of inertia of a uniform road about its centre of mass is given by

There is an explanation of that here.

Then we simply use the usual formula for angular momentum, as follows

,

as required.

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: July 18, 2016
Today on TSR

### Three reasons you may feel demotivated right now

...and how to stay positive

### Can I get A*s if I start revising now?

Discussions on TSR

• Latest
Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

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