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Author Question: A person is walking outdoors on a cold day when the temperature is -20C. He is breathing at the rate ... (Read 39 times)

nautica902

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on: Jul 29, 2018
A person is walking outdoors on a cold day when the temperature is -20C. He is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales 0.0050 m3 of air.
 
  At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37C) before it is exhaled? The specific heat of air is 1020 J/kg  K and the density of air is 1.29 kg/m3.
  A) 90 W B) 150 W C) 60 W D) 100 W E) 300 W

Question 2

An n-type semiconductor is produced by
 
  A) pure crystals of germanium.
  B) doping the host crystal with donor impurities.
  C) doping the host crystal with acceptor impurities.
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Ahnyah

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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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nautica902

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Reply 2 on: Jul 29, 2018
Wow, this really help

cdmart10

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Reply 3 on: Yesterday
Excellent

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