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Author Question: Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the ... (Read 74 times)

serike

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on: Jul 29, 2018
Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the diameter of the other. How do the resistances of these two wires compare?
 
  A) The thicker wire has 1/3 the resistance of the thinner wire.
  B) The thicker wire has 1/9 the resistance of the thinner wire.
  C) The thicker wire has 3 times the resistance of the thinner wire.
  D) The thicker wire has 9 times the resistance of the thinner wire.
  E) The thicker wire has times the resistance of the thinner wire.

Question 2

How much thermal energy is required to raise the temperature of a 225-g lead ball from 15.0C to 25.0C? The specific heat of lead is 128 J/kg  K.
 
  A) 725 J
  B) 576 J
  C) 145 J
  D) 217 J
  E) 288 J


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isabelt_18

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

B

Answer to Question 2

E


serike

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Reply 2 on: Jul 29, 2018
Excellent

chereeb

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

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