PHYSICS 7C Study Guide - Circular Motion

At the instant of the figure, a 1.7 kg particle P has a positionvector r of magnitude 1.1 m and angle ?1 = 45° and a velocityvector v of magnitude 4.5 m/s and angle ?2 = 30°. Force F ofmagnitude 1.5 N and angle ?3 = 30° acts on P. All three vectors liein the xy plane.

(a) What is the angular momentum of the particle about theorigin?
kg·m2/s

(b) What is the torque acting on the particle about theorigin?
N·m

At the instant of the figure, a 1.7 kg particle P has a positionvector r of magnitude 1.1 m and angle ?1 = 45° and a velocityvector v of magnitude 4.5 m/s and angle ?2 = 30°. Force F ofmagnitude 1.5 N and angle ?3 = 30° acts on P. All three vectors liein the xy plane.

(a) What is the angular momentum of the particle about theorigin?
kg·m2/s

(b) What is the torque acting on the particle about theorigin?
N·m

For no apparent reason, a poodle is running at a constant speed of3.40 m/s in a circle with radius 2.9m. Let v1 be the velocityvector at time t1, and let v2 be the velocity vector at timet2

For change in t1 = 0.6s calculate the magnitude (to foursignificant figures) of the average acceleration?

For change in t1 = 0.6s calculate the direction (relative to v1) ofthe average acceleration, A(a/v)?