College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 99

The average number of hairs on the normal human scalp is 125 000. A healthy person loses about 65 hairs per day. (New hair from the hair follicle pushes the old hair out.) (a) How many hairs are lost in one month (b) Pattern baldness (top-of-the-head hair loss) affects about 35 million men in the United States. If an average of 15% of the scalp is bald, how many hairs are lost per year by one of these "bald is beautiful" people