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Author Question: What man-made object exceeded the speed of sound long before the invention of the airplane or the ... (Read 27 times)

mikaylakyoung

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on: Jul 27, 2018
What man-made object exceeded the speed of sound long before the invention of the airplane or the bullet?
 
  What will be an ideal response?

Question 2

An automobile initially moving 72. km/hr jams the brakes and skids to a stop in a distance of 24. meters on a dry pavement but stops in 81.6 m for a wet pavement (the auto weighs 2211. lbs, neglect reaction delay).
 
  (a) What is the coefficient of friction for dry weather?
  (b) What is the coefficient in wet weather conditions?
  (c) Is this the STATIC or the KINETIC coefficient?


bassamabas

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

A cracked whip creates a sonic boom.

Answer to Question 2

(a) 0.85
(b) 0.25
(c) kinetic coefficient


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mikaylakyoung

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Reply #2 on: Jul 27, 2018
Thanks


bassamabas

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Reply #3 on: Jul 27, 2018
Welcome :)


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