Material Aluminum Copper Gold Iron Platinum Silver Tungsten Problem Resistivity (2.m) 2.65 x 10-8 1.68 x 10-8 2.44 x 10-8 9.71 x 10-8 10.6 x 10-8 1.59 x 10-8 5.60 x 10-8 As shown below, an insulated tungsten wire is immersed in 398 g of water at 12 °C. The wire is 1.9 cm long and has a cross-sectional area of 0.006 cm². wire A.) Determine how much heat is needed to bring the water to a boil. The specific heat of water is 4186 J/kg.K. Q = B.) Determine how long it will take to bring the water to a boil if a 13 A current is run through the wire. Assume all the thermal energy generated by the wire is absorbed by the water. Δt =
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
According the question data provided in the question.
m=398 grams
T1=12
T2=100 { Boiling temperature of the water }
L=1.9cm =0.019m
A=0.006c299m2
C=4186J/kgK
I=13amp.
Resistivity of the tungsten=5.60x10-8
We need to find
(a) Heat required
(b) time taken by the system to boil water
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