In my humid climates where there are numerous bodies of water, such as in Florida, it is unusual for temperatures to rise above about
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Chapter 14 Solutions
College Physics
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- The temperature of the ocean off the coast of New Jersey ranges from about 3 °C in late winter to about 24 °C in late summer. If we assume that the ocean temperature is representative of a layer that is 25 m deep and the only exchange of energy is at the ocean surface, what is the average energy flux at ocean surface that would be required to account for this temperature change?arrow_forward#1. Consider a lake in Vermont at the end of summer. At the end of summer, you can assume the average surface water temperature is about 20 °C and the bottom of the lake is about 10 °C. Explain in detail what happens as the cold air of winter arrives. Be sure to discuss in detail how various heat transfer mechanisms are working.arrow_forwardYou have soil (p = 2050 kg/m^3, k = 0.52, c_p = 1840 J/kg - k) that is at an initial temperature of 15.0°C. During a long cold spell of 12 weeks, the surface temperature is lowered to -10.0°C. Determine the minimum distance below the surface that a water pipe would need to be buried to keep it from freezing.arrow_forward
- When night falls, the temperature of the earth’s surface starts to drop. On a cool night, dew starts to form on the grass as water vapor condenses. Once dew starts to form, the rate of temperature decrease slows. Explain why this change occurs.arrow_forwardA certain Volkswagen Beetle is air-tight, so that when the doors are closed and the windows rolled up, no air can escape or enter. Suppose the car is parked with its doors closed and the interior air at an initial pressure of 1.00 atmosphere, and the initial temperature Ti = 22,0° C. Later, due to the greenhouse effect, the temperature rises to T2 = 52° C. What will be the air pressure inside the car?arrow_forwardA mountain hiker tightens the cap on a half-full plastic water bottle at a high altitude. The volume of air in the sealed bottle is 5 x 10-4 m³, the pressure is 64 kPa and the temperature is -8 °C. The hiker descends to a lower altitude where the pressure is 94.2 kPa and the temperature is 11 °C. What is the final volume of the sealed air inside the bottle? (this is what causes the plastic bottle to deform if you've ever experience this situation)arrow_forward
- On a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 34°C for the rest of the afternoon. If the time constant for the building is 5 hr, what will be the temperature inside the building at 4:00 P.M.? At 6:00 P.M.? When will the temperature inside the building reach 26°C? At 4:00 P.M., the temperature inside the building will be about (Round to the nearest tenth as needed.) 1°C.arrow_forward8. A tourist rents a jeep in Hilo where the temperature is 20 °C and the absolute atmospheric pressure is 1.01 x 10° Pa. She then drives up to the peak of Mauna Kea where the temperature falls to -5 °C. If the volume of the air in the tires does not change, what is the absolute pressure of the tires at the top of the mountain? (Hint: Must use absolute temperatures to solve problem TK = TCelsius + 273.) CS Scanned with CamScannerarrow_forwardOn a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 34°C for the rest of the afternoon. If the time constant for the building is 5 hr, what will be the temperature inside the building at 3:00 P.M.? At 5:00 P.M.? When will the temperature inside the building reach 26°C? RIB °C. At 3:00 P.M., the temperature inside the building will be about (Round to the nearest tenth as needed.)arrow_forward
- It is well known that wind makes the cold air feel much colder as a result of the wind chill effect that is due to the increase in the convection heat transfer coefficient with increasing air velocity. The wind chill effect is usually expressed in terms of the wind chill temperature (WCT), which is the apparent temperature felt by exposed skin. For outdoor air temperature of 0°C, for example, the wind chill temperature is 25°C at 20 km/h winds and -9°C at 60 km/h winds. That is, a person exposed to 0°C windy air at 20 km/h will feel as cold as a person exposed to -5°C calm air (air motion under 5 km/h). For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 170-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 15 W/m2·K, determine the rate of heat loss from this man by convection in still air at 20°C. What would your answer be if the…arrow_forwardQ5arrow_forwardThe average thermal conductivity of the walls (including windows) and roof of a house in the figure shown below is 4.8 x 104 kW/m - °C, and their average thickness is 20.8 cm. The house is heated with natural gas, with a heat of combustion (energy given off per cubic meter of gas burned) of 9,300 kcal/m3. How many cubic meters of gas must be burned each day to maintain an inside temperature of 27.3°C if the outside temperature is 0.0°C? Disregard surface air layers, radiation, and energy loss by heat through the ground. m3 37.0 5.00 m 8.00 m 10.0 marrow_forward
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