Hot air at 80°C is blown over a 2m x 4m flat surface at 30°C. If the average convection heat transfer coefficient is 55 W/m2-K, determine the rate of heat transfer from the air to the plate, in kW.
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- Electronic device generates 30 W of heat during normal operation. The heat is dissipated from the surface of the device to ambient air at 21°C. If the top surface area is 0.162 m² and the convection heat transfer coefficient is 7.97 W/m²•K, what will be the surface temperature in Celsius of the device.The water in a fishbowl has an evaporation rate of 0.050 g/s. The heat-transfer rate to the bowl by conduction, convection, and radiation is +36 W. At what rate must the water be heated by an electric heater to keep its temperature constant?A hot steel plate with a surface area of 1.52 m2 and a constant surface temperature of 166°C is exposed to ambient air at 22°C. If the convection heat transfer coefficient is 15.9 W/m². K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]? T. S Air, T, 00
- Problem 6: You have 4.9 kg of water in an insulated container. You add 0.95 kg of ice at -21 °C to the water and the mix reaches a final, equilibrium temperature of 11 °C. The specific heats of ice and water are 2.10 ×103 J/kg⋅C° and 4.19 ×103 J/kg⋅C°, respectively, and the latent heat of fusion for water is 3.34 ×105 J/kg. Calculate the initial temperature of the water, in degrees Celsius.(a) A 1.8 cm thick wooden floor covers a 4.0 m × 5.5 m room. The subfloor is at a temperature of 16.2 ˚C, while the air in the room is at 19.6 ˚C. What is the rate of heat conduction through the floor? The thermal conductivity for wood is 0.2 W / (m K) (b) Seals can cool themselves by using thermal windows, spots on their bodies with a much higher than average surface temperature. Suppose a seal has a thermal window of 0.030m2 at a temperature of 30˚C. If the seal's environment is frosted at -10˚C, what is the net rate of radiation energy loss? Assume an emissivity equal to 0.97. (please show steps, explanation and formulas)physics Give me a solution 8. How will the value of angular momentum change if the mass and angular velocity is maintained but the radius of the circular path is reduced to half the original? A. Angular momentum will decrease by a factor of four. B. Angular momentum will be doubled. C. Angular momentum will be halved. D. Angular momentum will increase by a factor of four.
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