How Does the Radius Affect Angular Momentum of a Cone?

AI Thread Summary
The discussion focuses on understanding how the radius of a cone affects its angular momentum along the z-axis. As the radius increases, the angular momentum changes because a larger radius requires a faster spin to maintain the same angular momentum. The formula for angular momentum is presented as an integral involving the rotational inertia and angular velocity. The mass of the cone is determined by integrating the mass density over its volume, while the center of mass and rotational inertia calculations involve similar density and volume considerations. The conversation emphasizes the relationship between radius, angular velocity, and angular momentum in rotational dynamics.
dowjonez
Messages
21
Reaction score
0
Thanks to everyones help i was able to understand the center of mass of a cone. Now i have to find the angular momentum along the z-axis

as i understand the angular momentum will change as the radius gets larger because the larger radius must spin faster .

H = height of cone

so the angular momentum = integral from 0 to H of Iw

thats as far as my thinking goes

if anyone could give me a hint it would be appreciated
 
Physics news on Phys.org
Mass of cone is integral of the "mass density" within the volume.
center-of-mass uses the same "mass density" and volume limits,
but multiplying the volume element by its location.
Rotational Inertia is the same mass density and same limits,
but multiplies the volume element by r^2 from the axis.
(the omega is the same for all points on the rigid body.)
 
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...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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...
Back
Top