Assuming your skin temperature is 37.2 °C and the temperature of your surroundings is 20.0 °C, determine the length of time required for you to radiate away the energy gained by eating a 278-C ice cream cone. Let the emissivity of your skin be 0.915 and its area be 1.78 m².
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- A sphere of radius 0.278 m, temperature 32.7°C, and emissivity 0.810 is located in an environment of temperature 90.7°C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?. At what net rate does heat radiate from a 250- m² black roof on a night when the roof's temperature is 30°C and the surrounding temperature is 15°C? The emissivity of the roof is 0.900. The Stefan- Boltzmann's constant is σ =5.67 × 10−8 J/(s m² K4). Hint: The roof radiates heat to the surroundings but also absorbs heat from the surroundings. Use the sign convention for heat leaving and entering a system. Pnet =Q/t= 4.44 x10³× W ! No, that's not the correct answer.Questions 13 through 14 pertain to the situation described below: A 73.0-kg man is in an environment of –10.0°C. The temperature, area, and emissivity of his skin are 33.0°C, 1.73 m², and 0.820, respectively. Assume that his metabolic energy production is 211 J/s and his specific heat is 3.50 × 10³ J/(kg K). (13) What is the net emission power of his body? (A) 341 W; (B) 321 W; (C) 301 W; (D) 281 W; (E) 261 W. (14) What is the rate of his body temperature drop? (A) 2.39°F/hr; (B) 2.59°F/hr; (C) 2.79°F/hr; (D) 2.99°F/hr; (E) 3.19°F/hr.
- Suppose you stand with one foot on ceramic flooring and one foot on a wool carpet, making contact over an area of 80 cm² with each foot. Both the ceramic and the carpet are 1.9 cm thick and are 8 deg C on their bottom sides. At what rate must heat transfer occur from each foot to keep the top of the ceramic and carpet at 35 deg C? The thermal conductivity of carpet k =0.04 J/(s m °C) The thermal conductivity of ceramic k =0.84 J/(s m º°C) Rate of Heat Transfer of Wool = 0.04547 t W Rate of Heat Transfer of Cermaic Qc 0.5657 t ✓ W No, that's not the correct answer.A sphere of radius 0.500 m, temperature 27.0°C, and emissivity 0.850 is located in an environment of temperature 77.0°C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?Imagine a person standing naked in a room at 23.3°C. The walls are well insulated, so they also are at 23.3°C. The person’s surface area is 2.20 m2, and his basal metabolic rate is 2167 kcal/day. His emissivity is 0.970. a) If the person’s skin temperature were 35.7°C (the same as the internal body temperature), at what net rate would heat be lost through radiation? (Ignore losses by conduction and convection.) b) The heat loss is not sustainable—but skin temperature is less than internal body temperature. What will be the skin temperature( in Celsius) such that the net heat loss due to radiation is equal to the basal metabolic rate? c) How does wearing clothing slow the loss of heat? Choose one of the following: a. by convection b. by conduction and convection c. by conduction d. by radiation
- An electric stove burner has surface area 325 cm² and emissivity e = 1. The burner consumes 1500 W and is at 900 K. If room temperature is 300 K, what fraction of the burner's heat loss is from radiation?A hot metal ball is hung in an oven that is maintained at 700 K; and it cools. When the temperature of the ball is 950 K, it is losing heat at a rate of 0.15 J/min. At what rate will the ball lose heat when the ball reaches 820 K? Assume that the emissivity of the ball and its surface area do not change appreciably with temperature.An unknown substance has a mass of 0.125 kg and an initial temperature of 94.5°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at 25.5°C. The mass of the aluminum container is 0.150 kg, and the temperature of the calorimeter increases to a final equilibrium.temperature of 32.0°C. Assuming no thermal energy is transferred to the environment, calculate the specific heat of the unknown substance. J/kg - °C Need Help? Read It MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER SERCP11 11.4.P.033.MI.
- The surface of the Sun has a temperature of about 5 800 K. The radius of the Sun is 6.96 × 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity is 0.986.A large cylindrical coffee pot in a coffee shop filled with 10.0 kg of hot coffee at temperature T = 95.0 ° C rests on a wooden table. The steel pot has radius r = 8.00 cm and height h = 50.0 cm and an emissivity e = 0.600. See figure. Assume that all heat loss is radiative through the side and top of the pot, given that wood is a relatively poor thermal conductor. The coffee shop ambient temperature T = 20.0 ° C. a) Find the rate at which the coffee losses heat. b) Assuming constant heat loss rate, what is the coffee temperature after 10.0 minutes have elapsed? Cw = 4.19 x 103 J/kg °C, ρw = 1.00 x 103 kg/m3, σ = 5.67 x 10 -8 W/m2 K4A block of iron (c=448.00 J/kj°C) initially at temperature 6.00°C is dropped into an insulated container filled with 15.71kg of water ( cwater=4186.00 J/kg°C) at 93.00°C. They come to equilibrium at a final temperature of 39.00°C. Determine the mass of the iron block. _____kg Determine the magnitude of thermal energy Q transferred between the two substances. ______kJ