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Author Question: The velocity of a particle (m = 10 mg, q = -4.0 mC) at t = 0 is 20 m/s in the positive x direction. ... (Read 108 times)

LCritchfi

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on: Jul 28, 2018
The velocity of a particle (m = 10 mg, q = -4.0 mC) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
 a. 60 m/s
  b. 20 m/s
  c. 45 m/s
  d. 40 m/s
  e. 70 m/s

Question 2

A charge of 50-mC is placed on the y axis at y = 3.0 cm and a 77-mC charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
 a. 1.2  1020 m/s2
  b. 1.5  1020 m/s2
  c. 1.0  1020 m/s2
  d. 1.8  1020 m/s2
  e. 2.0  1020 m/s2


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Ashley I

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

B

Answer to Question 2

A


LCritchfi

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


Ashley I

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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