A tap supplies water at 10degree Celsius and another tap at 100degree Celsius. How much hot water must be taken so that we get 20kg water at 35degree Celsius? A-7.2kg,b-10kg,c-5.6kg,d-19.9kg
If m1 kg of hot water and m2 kg of cold water are mixed to get 20kg water at 35ºC
The amount of heat released by the hot water by cooling =The amount of heat absorbed by the cold water to get heated
m1 x s (100ºC-35ºC) = m2 x s (10ºC-35ºC)
m1 = (m2 x 25) /65
but m1 +m2 = 20
Thus,
m1=5.6kg
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
You have rated this answer /10
Browse free questions and answers by Chapters
- 1 Thermodynamics
- 2 Gravitation
- 3 Electromagnetic Waves
- 4 Communication Systems
- 5 Laws of Motion
- 6 Current Electricity
- 7 Work, Energy and Power
- 8 Kinematics
- 9 Physics and Measurement
- 10 Rotational Motion
- 11 Properties of Solids and Liquids
- 12 Kinetic Theory of Gases
- 13 Oscillations and Waves
- 14 Electrostatics
- 15 Magnetic Effects of Current and Magnetism
- 16 Electromagnetic Induction and Alternating Currents
- 17 Optics
- 18 Dual Nature of Matter and Radiation
- 19 Atoms and Nuclei
- 20 Electronic Devices