NEWTON'S LAW OF COOLING

Newton laws OF cooling

Stefan's Law || Newton's Law, Average Rate OF Cooling

A body cools in 7 minutes from 60^(@)C to 40^(@)C . What will be its temperature after the next 7 minutes? The temperature of the surrounding is 10^(@)C . Assume that Newton's law of cooling holds good throughout the process.

A hot liquid is kept in a bog room. Accoding to Newton's law of cooling rate of cooling liquid (represented as y) is plotted against its temperature T . Which of the following curves may represent the plot?

Ac cording to Newton's law of cooling, the rate of cooling of a body is proportional to (Delta theta)^(n) , where Delta theta is the difference of the temperature of the body and thae surrounding. What is the value of n out of 4,3,2,and 1?

A calorimeter containing a hot lilquid is placed inside an enclosure whose walls are at 10^(@)C and cools from 80^(@)C to 60^(@)C in 10 minutes. How long will it take to cool from 60^(@)C to 40^(@)C , if Newton's law of cooling holds good ?

A body with an initial temperature theta_(1) is allowed to cool in a surrounding which is at a constant temperature of theta_(0) (theta lt theta_(1)) Assume that Newton's law of cooling is obeyed Let k = constant The temperature of the body after time t is best experssed by .

A hot body placed in air is cooled down according to newton's law of cooling the rate of decrease of temperature being k times the temperature difference from the surrounnding Starting from t =0 The time in which the body will lose half of the maximum heat is (xLn2)/(2k) Find the value of x .

A hot fbody placed in air is cooled down according to Newton's law of cooling, the rate of decrease of temperature being k times the temperature difference from the surrounding. Starting from t=0 , find the time in which the body will loss half the maximum heat it can lose.

A container with 1 kg of water in it kept in sunlight , which causes the water to get warmer than the surroundings . The average energy per time per unit area received due to the sunlight is 700 W m^(-2) and it is absorbed by the water over an effective area of 0.05 m^(2) . Assuming that the heat loss from the water to the surroundings is governed by Newton's law of cooling , the difference (in ""^(@) C ) in the temperature of water and the surroundings after a long time will be ________ . (Ignore effect of the container, and take constant for Newton's law of cooling = 0.001 s^(-1) , Heat capacity of water = 4200 J kg^(-1) K^(-1) )