We went over problems involving conservation of momentum, considering examples of both inelastic and elastic collisions.

We went over a problem based on the concept of rotational equilibrium (the balancing of clockwise and couterclockwise torques).

We started to discuss the rotational equivalent of the equation F=ma, namely that if there is a net torque on an object, that the object in turn, will experience an angular acceleration.

A practice test on the material on lecture exam 3.

1. a. Velocity at spout 2.54 m/s; b. 2.07 seconds to fill half-liter bottle
2. a. change in energy 674400 Joules; b. Force 6744 newtons
3. The bead would not fly off the end with the values given. If I change the k to 500 N/m, then I find the velocity leaving the wire to be 1.53 m/s and the velocity just before it hits the ground to be 3.49 m/s.
4. a. Buoyant up, weight and drag down; b. a=1000m/s²; c. v 0.643 m/s

Problem session for Friday's exam.