A 50. cm diameter wheel is rotating initially at 2.0 revolutions ...

[cdr_15]

A 50. cm diameter wheel is rotating initially at 2.0 revolutions per second. It slows down uniformly and comes to rest in 15 seconds.
 
  (a) What was its angular acceleration?
  (b) Through how many revolutions did it turn in those 15 s?

Question 2

The near point of a farsighted person is 100 cm. She places reading glasses close to her eye, and with them she can comfortably read a newspaper at a distance of 25 cm. What lens power is required?
 
  A) +2.5 D
  B) +3.0 D
  C) -2.0 D
  D) +3.2 D
  E) -2.5 D

[Fayaz00962]

Answer to Question 1

(a) -0.13 rev/s2 = -0.84 rad/s2
(b) 15. rev

Answer to Question 2

B

[cdr_15]

Thank you!

[Fayaz00962]

Always glad to help...