The two objects in the drawing are made from the same material (emissivity = 0.500) and have a temperature of 323 K. One is a cube ofedge length ro = 0.280 m, and the other is a sphere of radius ro. They are placed in a room whose temperature is 435 K. What is themagnitude of the difference between the net power absorbed by the cube and the sphere? The surface area of a sphere is 4πr².TOTO

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Answered: The two objects in the drawing are made…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Imagine a physics lecture hall with 83 students who are settling in for a 1-hour lecture. At the start of the lecture, the temperature of the air in the room is a comfortable 70oF (21.1°C). Unfortunately, the room’s air conditioner breaks right as the lecture begins. Each student has an average power output of about 60.0 W at room temperature. Imagine the energy released by each student goes into heating just the air in the room, which has a volume of 9.50 × 102 m3 and a density of 1.20 kg/m3. Assume the volume of the air remains constant and the specific heat capacity of the air is 718 J/(kg · °C). Calculate the room’s temperature at the end of the lecture in oF (the answer may sound high (!), but in reality, a significant portion of the heat produced would be absorbed by the walls, ceiling, floors, chairs, desks, and so on, which we are neglecting).
A 150-g aluminum cup contains 750 g of water in thermal equilibrium with the cup at 90°C. The combination of cup and water is cooled uniformly so that the temperature decreases by 1.3°C per minute. At what rate is energy being removed? Express your answer in watts. ?W
Lead pellets, each of mass 1.00 g, are heated to 200°C. How many pellets must be added to 500 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container.
What are the surface energy and work function at room temperature (25C), 250C and 300C for the following metal sheets of 10 mil each. Niobium, Tungsten, Tantalum, Rhenium, Ruthenium, Platinum, Aluminum, Stainless Steel (304, 316) . Surface energy is sometimes referred to surface tension. Work Function is a math extension of the surface tension and apparently refers to surface energy. There appears to be a lack of uniform definitions in the academic field regarding each of these definitions. Please clarify if possible.
A typical helium balloon contains 1.1 g of helium gas. At 20°C room temperature, what is the total kinetic energy of the helium in the balloon?
A 2.9 kg lump of aluminum is heated to 94°C and then dropped into 8.0 kg of water at 5.4°C. Assuming that the lump-water system is thermally isolated, what is the system's equilibrium temperature? Assume the specific heats of water and aluminum are 4186 and 900 J/kg-K, respectively. Number i Units
art 2: Problem Solving Questions P 1 (thermodynamics). What energy is required to convert a 3.00 g cube of ice at 213.15 K to liquid water at 355.15 K ?. (constants: specific heat for ice is 2090.0 J/kg⋅°C, latent heat of fusion of ice is 3.33⋅105 J/kg, specific heat for water is 4186.0 J/kg⋅°C).
With the following experimental data, calculate the average ignition temperature and the theoretical minimum ignition heat flux for the following thermally thick material.
Rubbing your hands together warms them by converting work into thermal energy. a. If a woman rubs her hands a total of 19 times (forward and backwards count separately), at a distance of 7.75 cm per rub, and with an average frictional force of 39 N, what is the temperature increase of her hands, in degrees Celsius? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers, and the heat capacity of her hands is 3500 J/(kg⋅°C).
A pond with a flat bottom has a surface area of 700 m² and a depth of 2.6 m. On a warm day, the surface water is at a temperature of 25°C, while the bottom of the pond is at 12°C. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pond. 420 × Your response differs from the correct answer by more than 10%. Double check your calculations. W
We often cut a watermelon in half and put it into the freezer to cool it quickly. But usually we forget to check on it and end up having a watermelon with a frozen layer on the top. To avoid this potential problem a person wants to set the timer such that it will go off when the temperature of the exposed surface of the watermelon drops to 3°C. Consider a 25-cm-diameter spherical watermelon that is cut into two equal parts and put into a freezer at -12°C. Initially, the entire watermelon is at a uniform temperature of 25°C, and the heat transfer coefficient on the surfaces is 22 W/m2·K. Assuming the watermelon to have the properties of water, determine how long it will take for the center of the exposed cut surfaces of the watermelon to drop to 3°C.
The p-V diagram in the figure shows two paths along which a sample of gas can be taken from state a to state b, where V = 3.0V1. Path 1 requires that energy equal to 5.0p,V be transferred to the gas as heat. Path 2 requires that energy equal to 5.5p,V, be transferred to the gas as heat. Determine the ratio 2. P1 P2 2 V

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