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Author Question: A +7.5-nC point charge is 5.0 cm from a -9.4-C point charge in your laboratory in California. How ... (Read 62 times)

Arii_bell

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on: Jul 29, 2018
A +7.5-nC point charge is 5.0 cm from a -9.4-C point charge in your laboratory in California.
 
  How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4-C charge to New York City? (k = 1/40 = 9.0  109 N  m2/C2 )

Question 2

A gas of helium atoms (each of mass 6.65  10-27 kg) are at room temperature of 20.0C.
 
  What is the de Broglie wavelength of the helium atoms that are moving at the root-mean-square speed? (h = 6.626  10-34 J  s, the Boltzmann constant is 1.38  10-23 J/K)
  A) 7.38  10-11 m
  B) 3.99  10-10 m
  C) 1.04  10-10 m
  D) 5.22  10-11 m
  E) 2.82  10-10 m


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karmakat49

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

13 mJ

Answer to Question 2

A


Arii_bell

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Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

ghepp

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Reply 3 on: Yesterday
Wow, this really help

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