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Author Question: Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them ... (Read 72 times)

rmenurse

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Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (0 = 8.85  10-12 C2/N  m2)
 
  A) 2.7  10-8 C/m2
  B) 1.6  10-4 C/m2
  C) 5.3  10-8 C/m2
  D) 3.3  10-4 C/m2

Question 2

A 1200-kg car is being raised with a constant acceleration of 2.53 m/s2 by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0  1011 N/m2.
 
  What is the change in length of the cable caused by lifting the car? A) 8.4 mm
  B) 8.4 cm
  C) 4.9 mm
  D) 4.9 cm
  E) 4.9 m


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daiying98

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rmenurse

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Reply 2 on: Jul 29, 2018
Wow, this really help


bassamabas

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Reply 3 on: Yesterday
Gracias!

 

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