Problem 1.34 prove p that in the absence of external forces, the total angular momentum (defined as l = α r α × p α ) of an n-particle system is conserved. [hints: you need to mimic the argument from (1.25) to (1.29). in this case you need more than newton’s third law: in addition you need to assume that the interparticle forces are central ; that is f αβ acts along the line joining particles α and β. a full discussion of angular momentum is given in chapter 3.]

yup its correct its: c) b b

so easy. just google the electromagnetic waves and it’ll pop up.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.