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Author Question: A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 C, and no other charges are ... (Read 36 times)

londonang

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on: Jul 29, 2018
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 C, and no other charges are present. (k = 1/40 = 8.99  109 N  m2/C2 )
 
  The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to
  A) zero.
  B) 674 kV.
  C) 1130 kV.
  D) 3380 kV.
  E) 9380 kV.

Question 2

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60  10-19 J, mH  mproton = 1.67  10-27 kg)
 
  A) 44.2 km/s
  B) 21.7 km/s
  C) 66.5 km/s
  D) 113 km/s
  E) 51.0 km/s


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31809pancho

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

B

Answer to Question 2

A


londonang

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Reply 2 on: Jul 29, 2018
Gracias!

mohan

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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