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Author Question: A metal has a latent heat of fusion of 2.32 104 J/kg, a specific heat of 128 J/kg K, and a melting ... (Read 169 times)

penguins

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on: Jul 29, 2018
A metal has a latent heat of fusion of 2.32  104 J/kg, a specific heat of 128 J/kg  K, and a melting point of 228C. A 30-g pellet of this metal at 16C hits a solid wall and comes to a complete stop.
 
  What would the speed of the pellet have to be in order for it to melt completely when it hits the wall, assuming that all of its kinetic energy is transformed into heat within the pellet? A) 207 m/s
  B) 215 m/s
  C) 232 m/s
  D) 273 m/s
  E) 317 m/s

Question 2

A heat engine having the maximum possible efficiency has an efficiency of 25 when operating between two heat reservoirs. If the temperature of the cold reservoir is 300 K, what is the temperature of the hot reservoir?
 
  A) 375 K B) 450 K C) 400 K D) 350 K E) 500 K
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Leostella20

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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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penguins

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Reply 2 on: Jul 29, 2018
Excellent

ecabral0

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

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