Showing the working for angular momentum

AI Thread Summary
To calculate angular momentum for a diver spinning, the formula H = Iw is used, where I is the moment of inertia and w is the angular velocity. Given I = 18 kg·m² and w = 7.9 rad/s, the calculation yields H = 142.20 kg·m²/s. The units for angular momentum are kg·m²/s, not just kg·m or radians. It's important to note that angular momentum is calculated about a specific point, typically the center of mass.
Rbraind
Messages
10
Reaction score
0

Homework Statement



A diver is spinning, I know the moment of inertia and the angular velocity. I've been asked to calculate angular momentum. Just H=Iw (yes?) Just when I show the answer is it kg.m or radians?

Homework Equations



H=Iw

The Attempt at a Solution



I=18kgm2
w = 7.9 rad/s

H= (18kgm2)(7.9rad/s)
H= (324kg.m)(7.9rad/s)
H=142.20 kg.m ?
 
Physics news on Phys.org
Couldn't get your question...
Angular momentum is always calculated about a point. If that point is the center of mass of the body, the the value of ang momentum is Iw!
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Angular Momentum Problem: Mouse walking on a rotating turntable
Replies
5
Views
1K
Conservation of Angular Momentum -- Child jumping onto a Merry-Go-Round
Replies
18
Views
6K
How Do You Correctly Cancel Angular Momentum in Physics Problems?
Replies
3
Views
1K
Conservation of angular momentum
Replies
2
Views
2K
About linear and angular momentum
Replies
12
Views
2K
Angular momentum and a summersault problem
Replies
19
Views
2K
Collision of a bullet on a rod-string system: query
2
Replies
70
Views
2K
Determining $L_{o}$: Finding Angular Momentum of System
Replies
45
Views
4K
Real life problem about angular momentum conservation
Replies
16
Views
4K
Why Is the Calculated Angular Momentum of the Pucks Zero?
Replies
5
Views
6K

Hot Threads

Recent Insights

Back
Top