An object is heated to 90°C and is kept in a room where the ambient temperature is around 25°C. If the object has an emissivity of 0.4 and an area of 2.0 m² what will be the rate of heat transfer by radiation alone?

A plastic cup of negligible mass contains 0.280 kg of an unknown liquid at a temperature of 30.0°C. A 0.0270 kg mass of ice at a temperature of 0.0°C is added to the liquid, and when thermal equilibrium is reached the temperature of the combined substances is 14.0°C. Assuming no heat is exchanged with the surroundings, what is the specific heat capacity of the unknown liquid?

A refrigerator door is opened and room-temperature air (20°C) fills the 1.50 m 3 compartment. A 10.0 kgm turkey, also at room temperature, is placed in the refrigerator and the door is closed. The density of air is 1.20 kgm/m3 and its specific heat is 1020 J / kgm °C. Assume the specific heat of a turkey, like that of a human, is 3480 J / kgm °C. How much heat must the refrigerator remove from its compartment to bring the air and the turkey to thermal equilibrium at a temperature of 5°C? Assume no heat exchange with the surrounding environment.

What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room whose ambient temperature is 22.0°C. The person has a normal skin temperature of 33.0°C and a surface area of 1.50 m². The emissivity of skin is 0.97 in the infrared, where the radiation takes place.

A thermally isolated container has 479 grams of water in it and a 376 gram plastic block. The water had an initial temperature of 352 K. The plastic had an initial temperature of 300 K. The plastic and water reach an equilibrium temperature of 342 K. Water has a specific heat of 4.182 J/(gram K). What is the specific heat of the plastic block in J/(gram K)?

assume that for any movement, 10.0% of energy used by human muscles goes into performing the movement, with the rest going into heat. If so, how much does a 72.0 kg person's body temperature go up when they use their muscles to speed up from 0 to 3.00 m/s? (The average specific heat capacity of a body is about 3.45 kJ/kg degress celsius)

A person steps out of the shower and dries off. The person's skin with an emissivity of 0.70 has a total area of 1.2 m and a temperature of 33 °C. What is the net rate at which energy is lost to the room through radiation by the naked person if the room temperature is 24 °C?

Suppose you walk into a sauna that has an ambient temperature of 65.0°C. (a) Calculate the rate of heat transfer to you by radiation given your skin temperature is 37.0°C, the emissivity of skin is 0.98, and the surface area of your body is 1.50 m². (b) If all other forms of heat transfer are balanced (the net heat transfer is zero), at what rate will your body temperature increase if your mass is 60.0 kg? O A. None of the options provided is correct. O B. a) 1.89 kW, b) 137.7°C/h O C. a) 2 kW, b) 10°C/h ○ D. a) 318.5 W, b) 5.46 °C/h ○ E. a) 5.46 W, b) 318.5 °C/h

To defog the rear window of an automobile, a very thin transparent heating element is attached to the inner surface of the window. A uniform heat flux of 1300 W/m2 is provided to the heating element for defogging a rear window with thickness of 5 mm. The interior temperature of the automobile is 22°C and the convection heat transfer coefficient is 15 W/m2·K. The outside ambient temperature is -5°C and the convection heat transfer coefficient is 100 W/m2·K. If the thermal conductivity of the window is 1.2 W/m·K, determine the inner surface temperature of the window.

If the body’s surface temperature is 35 degrees Celsius, what is the net rate of heat loss on a chilly 4 degrees Celsius day. All human skin is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.97.