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Author Question: A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s ... (Read 20 times)

jCorn1234

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on: Jul 29, 2018
A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail.
 
  Half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg  K.
  A) 8.1 K
  B) 3.6 K
  C) 1.8 K
  D) 2.7 K
  E) 7.7 K

Question 2

For what wavelength does a 100-mW laser beam deliver 1.6  1017 photons in one second? (c = 3.0  108 m/s, h = 6.626  10-34 J  s)
 
  A) 320 nm B) 340 nm C) 330 nm D) 350 nm
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ashely1112

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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jCorn1234

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Reply 2 on: Jul 29, 2018
:D TYSM

isabelt_18

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Reply 3 on: Yesterday
Gracias!

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