College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A cubical piece of heat-shield-tile from the space shuttle measures 0.13 m on a side and has a thermal
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- One way to keep the contents of a garage from becoming too cold on a night when a severe subfreezing temperature is forecast is to put a tub of water in the garage. If the mass of the water is 122 kg and its initial temperature is 24.2°C, how much energy must the water transfer to its surroundings in order to freeze completely? The specific heat of water is 4186 J/kg·K, and the latent heat of fusion is 333 kJ/kg.arrow_forwardA wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.13 m2 and whose thickness is 3 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 18 m2 and 0.15 m, respectively. Heat is lost via conduction through the wall and the window. The temperature difference between the inside and outside is the same for the wall and the window. Of the total heat lost by the wall and the window, what is the percentage lost by the window? Percentage lost by window = Number Units the tolerance is +/-2%arrow_forwardA wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.19 m² and whose thickness is 4 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 16 m² and 0.15 m, respectively. Heat is lost via conduction through the wall and the window. The temperature difference between the inside and outside is the same for the wall and the window. Of the total heat lost by the wall and the window, what is the percentage lost by the window? Percentage lost by window = Number i Unitsarrow_forward
- A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0°C is placed in a freezer. What is the final temperature if 430 kJ of energy is transferred from the bowl and soup? Assume the soup has the same thermal properties as that of water, the specific heat of the liquid soup is 1.00 kcal/(kg · °C), frozen soup is 0.500 kcal/(kg · °C), and the latent heat of fusion is 79.8 kcal/kg. The specific heat of aluminum is 0.215 kcal/(kg · °C).arrow_forwardA glass coffee pot has a circular bottom with a 9.00-cm diameter in contact with a heating element that keeps the coffee warm with a continuous heat transfer rate of 50.0 W(a) What is the temperature of the bottom of the pot, if it is 3.00 mm thick and the inside temperature is 60.0ºC ?(b) If the temperature of the coffee remains constant and all of the heat transfer is removed by evaporation, how many grams per minute evaporate? Take the heat of vaporization to be 2340 kJ/kg.arrow_forwardThe amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 260 J/s. The energy is transferred a distance of 1.5 x 103 m through a body whose surface area is 1.4 m². Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.arrow_forward
- Question 4. A glass windowpane in a home is 0.42 cm thick and has dimensions of 1.0 m x 2.0 m. On a certain day, the indoor temperature is 35 °C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant?arrow_forwardTo 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.arrow_forwardTwo cylindrical rods have the same mass. One is made of silver (density = 10 500 kg/m³), and one is made of iron (density = 7860 kg/m³). Both rods conduct the same amount of heat per second when the same temperature difference is maintained across their ends. What is the ratio (silver-to-iron) of (a) the lengths and (b) the radii of these rods? Give your answers as numbers with no units. (a) Number i (b) Number Units Unitsarrow_forward
- A Styrofoam box has a surface area of 0.81 m² and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 26°C. If it takes 8.5 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam. (Assume the ice is at a temperature of 0°C.) W/m · °Carrow_forwardYou drop an ice cube into an insulated bottle full of water and wait for the ice cube to completely melt. The ice cube initially has a mass of 70.0 g and a temperature of 0°C. The water (before the ice cube is added) has a mass of 880 g and an initial temperature of 20.0°C. What is the final temperature (in °C) of the mixture? (Assume no energy is lost to the walls of the bottle, or to the environment.) ?°Carrow_forwardA closed box is filled with dry ice at a temperature of -88.3 oC, while the outside temperature is 18.8 oC. The box is cubical, measuring 0.309 m on a side, and the thickness of the walls is 3.80 × 10-2 m. In one day, 3.62 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.arrow_forward
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