The discussion focuses on the angular momentum and net torque of a ball as measured around the origin. The angular momentum vector, denoted as L, is directed in the k̂ direction, while the net torque, τ, is determined to be zero. Key equations referenced include τ = r × F and L = r × p, emphasizing the importance of the right-hand rule in determining the direction of these vectors. The presence of tension in the rope and a magnetic field influences the forces acting on the ball, ultimately resulting in zero net torque.
PREREQUISITESStudents and educators in physics, particularly those studying mechanics, rotational dynamics, and electromagnetism. This discussion is beneficial for anyone seeking to understand the interplay between forces, torque, and angular momentum in physical systems.
Is this a multiple choice problem? I'm not sure I understand what you mean by which best describes the angular momentum.heartshapedbox said:
the correct answer is marked by "***" :)bigguccisosa said:
Ok thank you, I believe I understand. Right hand in direction of velocity, curl towards r, L is out of the page, so k direction.bigguccisosa said:
Yes right hand in direction of velocity (and so linear momentum), curl towards r, so L points in positive k. For torque you should be looking at the direction of the Forces, and crossing them with r. Note that the tension points towards the centre, and the magnetic force points away (F =qv x B). So if you cross them with respect to the r vector, do they contribute to torque? But yes in the end the torque is zero.heartshapedbox said:
