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Author Question: Alex throws a 0.43-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 ... (Read 49 times)

crobinson2013

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on: Jul 28, 2018
Alex throws a 0.43-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 5.5 m/s. What is the magnitude of the change in the ball's momentum?
 a. 0.09 kgm/s
  c. 4.3 kgm/s
  b. 1.0 kgm/s
  d. 5.2 kgm/s

Question 2

Two identical iron spheres have equal positive charges and the force between them when they are 1 m apart is 4 N. What percentage of the electrons has been removed from each sphere if each sphere has 1 mole (6  1023) of iron atoms? (ke = 8.99  109 Nm2/C2, the atomic number of iron is 26, and the electron charge is -1.6  10-19 C)
 a. 8  10-10
  c. 0.001
  b. 0.000002
  d. 4  10-10


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vickyvicksss

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Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

A


crobinson2013

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Reply #2 on: Jul 28, 2018
TY


vickyvicksss

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Reply #3 on: Jul 28, 2018
You're welcome


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