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Author Question: A crane drops a 0.40-kg steel ball onto a steel plate. The ball's speeds just before impact and ... (Read 139 times)

yoroshambo

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on: Jul 28, 2018
A crane drops a 0.40-kg steel ball onto a steel plate. The ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s, respectively. If the ball is in contact with the plate for 0.030 s, what is the magnitude of the average force that the ball exerts on the plate during impact?
 a. 87 N
  c. 3.0 N
  b. 116 N
  d. 3.5 N

Question 2

An electron with a speed of 2.0  106 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11  10-31 kg, e = 1.6  10-19 C)
 a. 3.5  10-8 s
  c. 2.3  10-8 s
  b. 2.3  10-6 s
  d. 1.2  10-7 s


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kardosa007

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

B

Answer to Question 2

A


yoroshambo

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Reply 2 on: Jul 28, 2018
Gracias!

31809pancho

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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