Asked by gpnkumar0 | 2nd Oct, 2017, 10:57: AM
The heat supplied to the kettle by the mains is H = VIt
Now, this heat is used to boil the water from 20 °C to 100 °C.
This heat used up is Q = mcΔT
Now, according to principle of calorimetry, H = Q.
VIt = mcΔT
t = (mcΔT)/VI = (1 × 4.2 × 103 × (373 - 293))/(220 × 4) = 381.8 s = 381.8/60 = 6.3 min
Hence, the correct answer is option C.
Answered by Romal Bhansali | 25th Oct, 2017, 03:43: PM
- what is thermodynamics
- On what factors does the amount of heat flowing through a body depend? Obtain the expression for the heat conducted.
- Mayer's formula
- State the first law of thermodynamics.
- State the zeroth law of thermodynamics.
- What thermodynamic variable is defined by (a) Zeroth Law? (b) First Law?
- (a) Does the first law of thermodynamics violate the law of conservation of energy? (b) Write the limitations of the first law of thermodynamics.
- Discuss the application of the first law of thermodynamics to Boiling process :
- Discuss the application of the first law of thermodynamics to Isothermal process.
- Derive a relation between the two specific heats of a gas on the basis of the first law of thermodynamics.
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