Question 6 Which of the choices below best describes the shape of the graph, esp

Question

Question 6 Which of the choices below best describes the shape of the graph, especially changes in the rate of cooling as the chocolate cools down, in terms of your observations in this lab. When the temperature difference between it and room temperature is small the rate of cooling is also small There is an inverse relationship between the temperature difference (between it and room temperature) and its rate of cooling O The rate of cooling is constant. When the temperature difference between it and room temperature is large the rate of cooling is also large

Explanation / Answer

6)newton laws of cooling is applicable for small difference in temperatures for body and surrounding

ieisdT/dt=fall of temperature=ba(theta-thetas)

here theta=temperature of body

thetas =temperature of surrounding

option 1 is correct answer

7)m1=m (hot water)

t1=90degrees centigrade

m2=2m(cold water)

t2=10degree centigade

hot and cold water are mixed so the final temperature of the mixture is

t=(m1s1t1+m2s2t2)/(m1s1+m2s2)

here s1=s2=specific heat of water

on simplifying we get

t=(90+(2x10))/(1+2)

=110/3

=36.7 degree centigrade

so answer is more than 10 and less than 90

so option 1 is approximate answer

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