Energy and the Environment - Sustainability - Chapter 4 .. Please help answering
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Question
Energy and the Environment - Sustainability - Chapter 4 ..
Please help answering Multiple choice questions:
IV, Multiple Choice Questions 1. Heat is A substance with a mass that flows from a high a. temperature toward a low temperature b. A mass-less substance that flows from a high temperature toward a low temperature. The result of the kinetic motion of particles. d. c. The same as work. The same as temperature. The reason sand gets warmer than water at sunny e. 2. beaches is that a. Sand is denser than water. b. Sand can trap heat much better than water. c. Sand has a higher specific heat than water. d. Sand has a lower specific heat than water. 400 watts low long e. Sand is less transparent than water to solar Mac (750 energy. A Btu is a unit of a. Heat flow rate. b. Energy. c. Power. d. e. 3. n who is rweight? to reduce over siX exercise Specific energy. None of the above. te of 50 . Heat transfer in solids is mostly by ump, on m. How a. b. c. d. e. Conduction. Convection. Radiation. Conduction and convection, but not radiation. Conduction, convection, and radiation. ary bike 20 km/h umption etabolic 139Explanation / Answer
1) the same as work.
change in the internal energy of a system is equal to the work done by the system and heat gained or lost by the system.
2)sand has lower specific heat than water.
speccific heat is the heat required to rise the temperature of a substance by one degree. water has a high specific heat (4200J/Kg). so water need a large amount of heat to rise its temperature.
3) energy
BTU is a unit of heat, it is the heat required to rise the temperature of 1 pound water by one fahrenheit. the imperial unit of specific energy is btu/pound. in the SI unit specific energy has a unit of J/Kg
4) conduction
conduction is the one of the mode of transfer of energy, atoms are closely packed in solids so energy can transfer to the nearest atoms, this will go like a chain.
5) convection
it is an another mode of energy transfer in which material transport takeplace, hotter less dense material rises and cold denser material sink and heat transport in the sliquid every where through this process.
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