Recent content by disillusion

consider the energy of the system. the ball has an initial K.E. The catcher and the ball are associated with some gravitational potential energy (depending on where you take your reference) for each revolution, the system lose energy as heat W=2(pi)a*friction.

I=mr2 for every point mass on the system. r is the distance between the point mass and the axis of rotation. In here you can just assume the outlets are point masses since the arms are light. But in general you need to sum up all the point masses so I=\sum m_{i}r_i^{2}

first line L=mvr. v is the velocity of the gas, not the jet. Also you need to consider the total angular momentum before and after.

you can use that formula to find the initial vertical velocity. Then you can work out an angle!

Take care with the sign of the acceleration. It is often helpful to write down on your diagram which direction you are taking as positive.

No. Try solving the equation again, and don't cancel out factors. The amplitude is the same on either side of the equilibrium because this is how it is defined. It is the position with minimum potential energy so greatest kinetic energy.

Homework Statement Two long concentric, cylindrical conductors of radii a and b (a<b), are maintained with a potential difference V and carry equal but opposite currents I. An electron, with velocity u parallel to the axis, enters the evacuated region between the conductors and travels...