Question

Platinum 10.6 x 108 1.59 x 108 Silver Tungsten 5.60 x 108 O Problem As shown below, an insulated platinum wire is immersed in 686 g of water at 17 C. The wire is 3.3 cm long and has a cross sectional area of 0.003 cm2. Determine how long it will take to bring the water to a boil if a 27 A current is run through the wire. Assume all the thermal energy generated by the wire is absorbed by the water. The specific heat of water is 4186 Jikg K 23.35 sec wire Submt Answer

please show formulas used and round four significant figures. thanks

Answer 1

Resistivity of Platinum (P)a 10.67168 ohmom Resistance of the wire (R) = le R 10.6x16 8x 3.3x26? A 100 ohon 0.003 x 10 4 11660x10 10+4 11660 16-6 1.166 x 102 & let us assuone it lakes t sec .. H. I'R & - = (27) ? x 1.166x10²xt This heat is absorbed by the water. i If we think the water as reaching the boiling point. is (27) х 1. 166 x 10 xt - meat ory (27) x 1-166 xlo'xf = 686x16 34 41 864 (100-17) 0x2 (21)*x 116.6.x loʻxta 686x103 x 4186883 ory 2.804610 * x 10 3x 10? or to 2.864x 10 sec a b= 7.79 has To boil more heat us needed Pria