Two friends A and B are waiting for another f | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) According to Newton's Law of Cooling,the rate of heat loss is proportional to the temperature difference between the object and its surroundings,i

Vedclass · Accepted Answer

$A$

Vedclass · Answer

(A) According to Newton's Law of Cooling,the rate of heat loss is proportional to the temperature difference between the object and its surroundings,i.e.,$\frac{dQ}{dt} \propto (T - T_s)$.In case of friend $A$,the cold milk is added immediately. This lowers the initial temperature of the tea mixture. Since the temperature difference between the mixture and the surroundings is smaller,the rate of heat loss is lower.In case of friend $B$,the tea remains at a higher temperature for a longer duration before the cold milk is added. Because the temperature difference between the hot tea and the surroundings is larger,the rate of heat loss is higher.Therefore,the tea in the cup of friend $A$ will remain hotter when the friend arrives.

Two friends $A$ and $B$ are waiting for another friend for tea. $A$ took the tea in a cup and mixed the cold milk and then waits. $B$ took the tea in the cup and then mixed the cold milk when the friend comes. Then the tea will be hotter in the cup of

Similar Questions

$A$ body takes $5$ minutes for cooling from $50^oC$ to $40^oC$. Its temperature comes down to $33.33^oC$ in the next $5$ minutes. The temperature of the surroundings is ....... $^oC$.

Discuss the experiment verifying Newton's law of cooling.

$A$ block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling?

$A$ solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature $120^{\circ}C$,then

According to Newton's law of cooling,the rate of cooling of a body is directly proportional to the ........

Vedclass Test Series

Exam Paper Generator

Online Exam Module