- #1
Vrbic
- 407
- 18
Homework Statement
A basketball player threw a ball with radius ##a## in such way that it rolls (without slipping) on a hoop of a basket with radius ##R##. Let's define an angle ##\theta## as a angle between a plane of basket and line between the point of touch of the ball and the hoop and the center of the ball. What is the dependence between ##\theta## and angular velocity of rolling ##\omega##?
Homework Equations
##F_g=mg##
##F_{od}=mv^2/r##
The Attempt at a Solution
I have some solution, but I don't know if it is right. I suppose there should be some balance between gravitational and centrifugal torque. It means I need to have same forces values of forces in incline coordinate system. I mean that x-axis will be aligned with line of indicating the angle ##\theta## and y-axis will be perpendicular to it. And origin in the center of the ball. Than I need to have projection of both forces to y-axis has to be same magnitude but opposite direction.
From that I have ##\sin{\theta}F_{od}=\cos{\theta}F_g## and result should be
##\omega=\sqrt{\cot{\theta}g/R }##
What do you mean about this solution?
I'm a bit suprised that I need not to know a radius of the ball.