It's possible to boil water by adding hot rocks to it, a technique that has been used in many societies over time. If you heat a rock in the fire, you can easily get it to a temperature of 500C. If you use granite or other similar stones, the specific heat is about 800 J / ( k g ⋅ K ).If 5.0 kg of water at 10∘C is in a leak-proof vessel, what minimum number of 1.0 kg stones must be added to bring the water to a boil?

Question

It&#039;s possible to boil water by adding hot rocks to it, a technique that has been used in many societies over time. If you heat a rock in the fire, you can easily get it to a temperature of 500C. If you use granite or other similar stones, the specific heat is about   800  J      /    (  k  g  ⋅  K  ).If 5.0 kg of water at 10∘C is in a leak-proof vessel, what minimum number of 1.0 kg stones must be added to bring the water to a boil?

Clarence Terrell · Accepted Answer

Answer:6Explanation:m = Massc = Specific heat  Δ  T= Change in temperatures denotes stoneHeat is given by  Q  =  m  c  Δ  T    ⇒  Q  =  5  ×  4180  ×  (  100  −  10  )    ⇒  Q  =  1881000  JHeat for the stone  Q  =      m    s        c    s    Δ  T    ⇒  1881000  =      m    s    800  ×  (  500  −  100  )    ⇒      m    s    =      1881000          800      ×      (      500      −      100      )          ⇒      m    s    =  5.878125  k  gNumber of stones is given by  n  =      5.878125    1      ⇒  n  ≈  6The number of stones is 6

Answered question

Answer & Explanation

New Questions in Thermal Physics