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Author Question: A 120-m long copper wire (resistivity 1.68 10-8 m) has resistance 6.0 . What is the diameter of the ... (Read 266 times)

krzymel

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on: Jul 29, 2018
A 120-m long copper wire (resistivity 1.68  10-8 m) has resistance 6.0 . What is the diameter of the wire?
 
  A)
 
  0.065 mm
  B)
 
  0.65 mm
  C)
 
  0.65 cm
  D)
 
  0.65 m
  E)
 
  6.5 m

Question 2

A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth,
 
  Andrea rides on a spaceship which travels away from Earth at a speed of 0.60c for five years (as measured by Courtney), then immediately turns around and comes back at 0.60c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return?
  A) 20 y B) 15 y C) 12 y D) 10 y E) 18 y


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momolu

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

E


krzymel

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Reply 2 on: Jul 29, 2018
Gracias!

laurnthompson

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Reply 3 on: Yesterday
Wow, this really help

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