Questions And Answers - Newton'S Law Of Cooling - Edubirdie

University:
Princeton University
Course:
PHY 103 | General Physics I
Academic year:

2023
Views:

57

Pages:

3
Author:

abdulsalam23745

?An object kept in a room having temperature 25°C takes 12minutes 10 coul from 30°C to 70°C The time taken 10 coolfrom further 10°C isa) 15 minutes b) 20minutesoc) iominules d) 12 minutesans: To = 25° =80°C70°C =ct = 12minT1- at T2 = K (TrittL 2 To)12 10 =K ( 80+70 2- 25 )5/6 = K ( 75 - 25)5/6 = KX' 50 -170°C 60°Ccltat10 = K (65-25)10 = KX40at5/6 = xx50at 5 = 4/560 = 4/3golt5x60 = 4x5xdt60 = at4cl t = sminutes? crotain quantity of watercools from 70°C to 60°Cin the first five minutes. Anelto 54°C tonext 5 minutes.Find time the temp of sur-ounding isans 7060°C Clt=556°It II k TITB-II)2at70-6070- K510,$6/3 = k(57 -To)2 = KC 65-To)36 x 1/2 5 = -57-To69-To3 57 - To965. To3(65-To) = 5 (57-To)195-3T0-285-570 =To60°C54°L at-52To = 90 To = 45°C

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