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  • 65 votes cast
Dec
1
asked Finding Rotational Kinetic Energy Of A Clock
Dec
1
comment Tensions And Pulleys With Masses
I actually figured it out. However, I have a new question: if the tension forces on either side of the pulley are different, then why is there only one acceleration for the two blocks and the particles on the outer rim of the pulley?
Dec
1
comment Tensions And Pulleys With Masses
I've sort of run into a road-block trying to solve this problem. I try to solve for the acceleration, but I have no way of eliminating the unknowns from my equations; what still remains is the two tensions forces. So, I tried to figure out how they were related through torque on the pulley; and despite the fact that there is a relationship, it introduces another unknown, namely, the torque. How do I solve for the acceleration?
Dec
1
comment Tensions And Pulleys With Masses
Oh, yes...The pulley would definitely have more rotational inertia, and that would diminish the amount of force transmitted, right?
Dec
1
revised Tensions And Pulleys With Masses
added 5 characters in body
Nov
30
comment Torque And Moment Of Inertia
What is effective mass, and what is c.g.?
Nov
30
accepted Two Different Sorts of Inertia: Inertial Mass and Moment of Inertia
Nov
30
accepted Torque And Moment Of Inertia
Nov
30
asked Tensions And Pulleys With Masses
Nov
26
revised Torque And Moment Of Inertia
added 84 characters in body
Nov
26
accepted Calculating Moment Of Inertia
Nov
26
asked Torque And Moment Of Inertia
Nov
26
comment Calculating Moment Of Inertia
Oh, so basically your process involves reconstituting the door by squishing the height, and uniformly concentrating the mass over the width?
Nov
26
comment Calculating Moment Of Inertia
So, there isn't really any intuitive way of seeing that the height isn't required?
Nov
25
comment Calculating Moment Of Inertia
Why is the height not needed, though?
Nov
25
asked Calculating Moment Of Inertia
Nov
25
asked Two Different Sorts of Inertia: Inertial Mass and Moment of Inertia
Nov
24
accepted Finding Constant Angular Acceleration
Nov
24
comment Finding Constant Angular Acceleration
Thank you very much! I completely forgot about the rotational kinematic equations, until you had refreshed my mind.
Nov
24
comment Finding Constant Angular Acceleration
@leongz Well, how would I find the time interval during which the centrifuge slows down?