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- . On a winter day, the air temperature is — 15°C, and the humidity is 0,001 kg/m3. (a) What is the relative humidity? (b) When this air is brought inside a building, it is heated to 20°C. If the humidity isn't changed, what is the relative humidity inside the building?Suppose you are an astronaut in the vacuum of space, hard at work in your sealed spacesuit. The only way that you can transfer heat to the environmentis byA. Conduction. B. Convection. C. Radiation. D. Evaporation.Do convection cells represent a reversible process?A. Yes, because they are orderly.B. No, because they transfer thermal energy from hot to cold.C. It depends on the type of convection cell.
- A. Both statements A and B are correct. B. Statement A is correct, and B is incorrect. C. Statement A is incorrect, and B is correct. D. Neither statement A nor B is correct A. The principle of convection is exemplified by the flow of warm water from the tropics to poles whereby this process helps in the distribution of heat on the surface of the Earth. B. Temperature is crucial to biomolecules because their physical and chemical properties which determine their functions is directly affected by it.1. What is the difference between heat transfer by conduction, convection and radiation?Identify whether the given situations are examples of conduction, convection orradiation.a. Solar ultraviolet radiation, precisely the process that determines the Earth’stemperature.b. Ironing of clothesc. When you walk barefoot on the hot street, and it burns your toes.d. The heat transferred by hand or hair dryere. When teaspoons get hot when placed in hot coffeef. The heat transfer generated by the human body when a person is barefoot.g. The heat emitted by a radiator.h. A thermometer works because the liquid in it contracts when heated.
- 3. Consider the following physical cases. Choose the letter that correctly matches each roman numeral with the appropriate heat transport mechanism. I. A young boy who jumps into a swimming pool feels cooler than the surroundings. II. On a freezing day, a gas station attendant finds the metal handle to a gasoline pump intolerably cold to grip. III. A camper gets warm in from of a campfire. a. I. Convection II. Conduction III. Radiation b. I. Conduction II. Radiation III. Convection c. I. Radiation II. Convection III. Conduction d. I. Conduction II. Convection III. Radiation e. I. Radiation II. Conduction II. Convection1. The heat transfer from a 2-m diameter sphere to a 25 deg. Celsius air stream over a period of time interval of 1 hour is 3,000 kJ. Estimate the surface temperature of the sphere if the heat transfer coefficient is 10 W/m?-K. (CONVECTION) 2. A plane wall is 2 meter high by 3 meter wide and is 2 cm thick. It is made of 0.50 W/m-K. A temperature difference of 60 K is imposed on the two large faces. Find the heat flux in Watts/m². (CONDUCTION)1. Air at 1 atm and 20°C is flowing over the top surface of a 0.5-m long thin plate. The airstream velocity is 50 m/s, and the plate is maintained at a constant surface temperature of 180°C. Determine the average convection heat transfer coefficient.
- 8. A farrier left a metal bar in a room of constant temperature of 0°C. The temperature of the metal bar drops from 120°C to 55°C after 25 minutes. In how many minutes will the metal bar continue to cool from 55°C to 50°C? * O A. 50. 3081 minutes B. 5.0308 minutes O C. 30. 5481 minutes O D. 3.0548 minutesIn an industrial factory, four different materials are heated up for the same temperature difference by providing energy. Which of the material will need more energy for the same temperature increase if O a. Nickle (C = 502.416 J/kg K) O b. Cobalt (C = 418.68 J/kg K) O c. Iron (C = 460.548 J/kg K) O d. Gold (C = 125.604 J/kg K)4. A 54-woman eats a 450 Calorie hamburger for snacks. How many joules of energy is the equivalent of one hamburger?