Question

How much time (in seconds) is needed for a surgical cauterizer to raise the temperature of 3.00 g of tissue from 37.0 degrees C to 100 degrees C ad then boil away 0.200 g of water, if it puts out 3.50 mA at 20.0 kV? Ignore heat transfer to the surroundings. (Assume the specific heat of tissue is 3,500 J/(kg*degreeC) and the latnet heat of vaporization of water is 2,256 kJ/kg.)

Answer 1

giver 39 af tissue from 37" yo MO°C 3.5 (Colt KJ 1149c т се АТ 3x10?x 3.5X10 xio {100 - 373 S 661.5 J g , ma=0.28 of water bail away = 2256 kJ kg/kg 9 2 = mmew 0.7x10x2256X103 Lw= 3 BE = 451.2 g 8.= 9, +9 1112.79 2 P = 94 9 1912.7 -Z 3 3.SX10 X 20x10 I T- 15.89571429 sec other possible case It water also has to brise from 37 to 100°c 99,- MyCat) - 0-2304.18 *[63] = 52.668 Dy=0,+9.78; pa 1165.368 =94 T 3.5X30, T= 16.648 Sec