Determine the Magnitude of the Time Rate of Change of Angular Momentum

AI Thread Summary
To determine the time rate of change of angular momentum for a rock thrown from a cliff, the initial conditions include a horizontal velocity of 20 ft/s and a height of 50 ft. The position vector at time t=1 second is needed to calculate angular momentum, which involves both horizontal and vertical components of motion. The discussion emphasizes the need to derive equations for horizontal and vertical speeds to find the force acting on the rock. Clarification on how to calculate the force based on the given velocity is also sought. Understanding these dynamics is crucial for solving the problem effectively.
Northbysouth
Messages
241
Reaction score
2

Homework Statement


In an experiment an individual throws a rock with an initial horizontal velocity of v0 = 20 ft/s at time t=0. The rock is thrown from the edge of a cliff (directly above the base of the cliff) at height h=50 ft from the ground. The origin is assigned at the base of the cliff. Determine the magnitude of the time rate of change of the angular momentum of the rock about O (H'O) at time t = 1 second


Homework Equations



HO = rXmv

H'O = MO

The Attempt at a Solution



I think that r = 50 ft j

But how do I find the force from the given velocity?

Any help would be appreciated.
 
Physics news on Phys.org
What force?
Can you write down equations for the horizontal and vertical speeds at time t?
 

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- Conserved or not?
Replies
17
Views
341
Angular momentum for a bullet and a rod attached to a ceiling
Replies
17
Views
1K
Determining $L_{o}$: Finding Angular Momentum of System
Replies
45
Views
4K
Ambiguous question on momentum and how it works...
Replies
13
Views
1K
Angular momentum of a rotating disc
Replies
3
Views
2K
Is the Angular Momentum of a Pendulum Conserved?
Replies
5
Views
6K
Conservation of angular momentum
Replies
22
Views
3K
Kepler's Third Law vs Conservation of angular momentum
Replies
8
Views
2K
Simple Ice Skater with Conservation of Angular Momentum
Replies
4
Views
2K
Find velocities when a mass leaves a system of a rod with two masses
Replies
10
Views
2K

Hot Threads

Recent Insights

Back
Top