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College Physics
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Publisher: Cengage Learning
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What happens to the temperature of something that
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- Why do fishermen sail out to the sea in the night? What process helps them to sail easily to the sea in the night and come back to the shore in the morning? think about processes like conduction, convection and radiationarrow_forwardTypical freshly cut "green" firewood contains about 50% water by weight; for seasoned wood, the comparable figure is about 20%. Firewood is usually sold by volume, so compare the energy available from a given volume of green wood with that available from seasoned wood. Assume an energy content of 20 MJ/kg for perfectly dry wood, and that 2.3 MJ/kg of energy is needed to vaporize water. Also assume that the wood has essentially the same volume whether green or seasoned.arrow_forwardA 14500 kg tractor trailer travels up and down a 75-meter hill on its way to pick up a load oflumber weighing 26000 kg. it then turns around and makes the trip back along the same route.Upon descending the hill in either direction the brakes absorb 20% of the truck’s energy. Whatwould the increase in temperature of the brakes be in each direction? (brake mass = 215kg,brake specific heat = 1100 J/kgC)arrow_forward
- When you turn your hot water on in the shower, it takes a bit for the water to get warm. Some of this is because the water in the pipe is cold but some of it is because the water from the hot water heater must heat the copper plumbing pipe itself. Copper has a specific heat of 0.39R. How much energy does it take to heat 2 kilograms of copper pipe from 70°F to 130°F? Report your answer in Joules. (Hint: Note that you'll need to convert kJ to J and F to K.)arrow_forwardWhich of the following is an example of heat transfer by radiation? When you walk on your tiled, kitchen floor, your feet feel cold. Someone warming their hands next to a fire. Touching a cold window with your warm hands. Someone warming their hands above a fire. Heat transfer through hot fluids rising and cold fluids sinking in a pot of boiling water.arrow_forwardThe process of heat radiation is the ONLY method of heat transfer that can occur under water.through space.through the air.through a solid.arrow_forward
- (a)Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared) to 4.0 m2 of the Earth's surface at night. Assume the emissivity is 0.95, the temperature of the Earth is 15°C, and that of outer space is 2.7 K. (Include the sign of the heat transfer to 4.0 m2 of the Earth's surface in the value of your answer.) (b)Compare the intensity of this radiation with that absorbed by the Earth from the Sun during the day. The intensity of the radiation from the Sun averages about 800 W/m2, only half of which is absorbed by the Earth. (c)What is the maximum magnetic field strength (in µT) in the outgoing radiation, assuming it is a continuous wave?arrow_forwardAs ice melts in a drink, is the heat gained by the ice equal to the heat lost by the drink? If it is in an insulated cup (like styrofoam)? I tried to calculate the values and what I got for the heat lost by the drink was a much larger number than heat gained by the ice after it meltsarrow_forward
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