16. A physics instructor got stuffed into a dryer of radius r = 1.8 m. The instructor weighs 840 N and the dryer moves at v = 8.5 x m/s.

a) Calculate the centripetal force on the instructor.

 

b) What is the centrifugal force on the instructor?

Charcoal from an ancient campfire has a ratio of 14C to 12C that isone-sixteenth that of new wood. About how old is the charcoal? Thehalf-life of 14C is 5730 years.
_____ years old

Carbon obtained from a sample of frozen skin in a glacier is foundto have one-sixteenth the 14C-to-12C ratio of present-day carbon.About how old is the skin? The half-life of 14C is 5730years.
(________)years old

A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the block be dropped to double that impact speed?

(a) The eighth floor

(b) The tenth floor

(c) The twelth floor

(d) The sixteenth floor