Week 15 (Nov. 18, 19, 20)
Reading:
Topics: Rotational inertia, torque, and angular momentum
No quiz.
Week 15 exercises:
No quiz.
Week 15 exercises:
- Ladder problem: A ladder weighing 400 N and a length 10 meters is placed against a smooth (frictionless) vertical wall. A person weighing 800 N stands on the ladder 2 meters from the bottom as measured along the ladder. The foot of the ladder is 8 meters from the bottom of the wall. The floor exerts a friction force, f, that keeps the ladder from sliding out. Calculate the normal force exerted by the wall, the friction force exerted by the floor, and the normal force exerted by the floor on the ladder.
- Two masses suspended from pulley: Suppose that, like in the previous problem from last week, a 10 kg mass is suspended from a string which is wrapped a bunch of times round the disk/pulley. But now suppose the other end of the string is attached to another (3 kg) mass suspended from the pulley. So as the 10 kg mass falls, the 3 kg mass rises. Repeat the previous problem. Here is a video solution.