The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of the cosmos at the rate of 10.7 W. HooRU's surface area is 1.67 m² and the emissivity of its surface is 0.227. Ignoring the radiation that HooRU absorbs from the cold universe, what is H0ORU's temperature T? T = K

. 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.

On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the resistance of the second layer is 0.2 ° C / W, and the third layer is 0.1 ° C / W. The overall temperature gradient in the wall is multilayered from one side. to the other side is 60 ° C. a. Determine the heat flux through the walls. = Answer watts / m2. b. If the thermal resistance of the second layer is changed to 0.3 ° C / W, what is the effect in% on heat flux, assuming the temperature gradient remains the same? = Answer Answer %.

The sun has a temperature of 6000 K and a radius of 6.07 x 10^18 m^2. What is the heat current if it has an emissivity of 1. The Stefan-Boltzmann constant is 5.67 x 10^-8 W/m?K4 8.89 x 10^26 W O 2.76 x 10^25 w O 1.98 x 10^7 W O 4.46 x 10^26 w

Newton's Law of Cooling The temperature, u, of a heated object at a given time t can be modeled by the equation u(t) = T+ (uo - T)et where k < 0 is a constant, T is constant ambient temperature, and up is the initial temperature of the heated object. Suppose that an object has been heated to 90 degrees celsius and is then allowed to cool in a room that is kept at a constant 45 degrees celsius. If the temperature of the object is 73 degrees celsius after 8 minutes, when will its temperature be 58 degrees celsius? minutes.

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A block of copper with mass 0.600 kg is heated to 400. degrees Celsius from 260. degrees Celsius. The specific heat capacity of copper is 387 J/ (kg°C). The heat absorbed by the copper block is  2.88 E5 J 3.25 E4 J 6.04 E5 J 9.29 E4 J

Please help! A student in a lecture hall has 0.310 m^2 of skin (arms, hands, and head) exposed. The skin is at 34.0°C and has an emissivity of 0.970. The temperature of the room is 20.2°C (air, walls, ceiling, and floor all at the same temperature). The Stefan-Boltzmann constant is 5.670 x 10-8 w/ (m2. k4 ). a) at what rate does the skin emit thermal radiation? b) at what rate does the skin absorb thermal radiation? THANK U

A 2-meter-long steel rod has a diameter equal to 2.54 cm. By how much does the rod’s length change in meters if it’s heated from 318 degrees Kelvin to 460 degrees Kelvin? _________ m . You should get a really small answer, feel free to use exponential notation to express it.

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 K4