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Author Question: A 50. cm diameter wheel is rotating initially at 2.0 revolutions per second. It slows down uniformly ... (Read 92 times)

cdr_15

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on: Jul 27, 2018
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


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Fayaz00962

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Reply #1 on: Jul 27, 2018
Answer to Question 1

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

Answer to Question 2

B


cdr_15

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Reply #2 on: Jul 27, 2018
Thank you!


Fayaz00962

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Reply #3 on: Jul 27, 2018
Always glad to help...


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