(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.)
. Double-paned thermal insulating windows consist of two glass panels separated by a narrow gap from which most of the air has been removed to create a near vacuum in the space between the panes. Explain how this design helps to better insulate a home than a window that is made from a single sheet of glass.
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- (¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . A potato will cook faster in a conventional oven if a large nail is inserted into it. Why?arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . In The Unparalleled Adventure of One Hans Pfaall" by Edgar Allen Poe, the hero discovers a gas whose density is '37.4 limes" less than that of hydrogen. How much better at lifting would a balloon filled with the new gas be compared to one filled with hydrogen?arrow_forwardThe amount of heat needed to reduce the temperature of 1.5 kg of snow from -15 degrees Celsius to -5 degrees Celsius is equal to (note that the specific heat of snow is 2060 joules/kg.degree). The unit must be written with the answer.arrow_forward
- An electric shower has a 1.5 kW heating element. (a).How much heat energy can it give out in five minutes? (b).If the element is used to heat 5 kg of water for 5 minutes, what would be the rise in temperature? (Specific heat capacity of water = 4180 J/kg).arrow_forwardIn an air conditioner, 12.65 MJ of heat transfer occurs from a cold environment in 1.00 h. (a) What mass of ice melting would involve the same heat transfer? (b) How many hours of operation would be equivalent to melting 900 kg ofice? (c) If ice costs 20 cents per kg, do you think the air conditioner could be operated more cheaply than by simply using ice? Describe in detail how you evaluate the relative costs.arrow_forwardA person consumes about 2600 Cal a day. 1 Cal = 4186 J, and 1 kWh = 860 Cal. What is this energy in kilowatt-hours? Express your answer using two significant figures.arrow_forward
- ...In an experiment, 1 kg of fuel was completely burnt. The heat produced was measured to be 9,000 kJ. a. What will be the head produced for 7 kg of fuel?arrow_forwardA 45-kg person drinks 5.6 × 102 g of milk, which has a caloric value of approximately 3.0 kJ/g. If only 17 percent of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? Enter your answer in scientific notation. Hint: The work done in ascending is given by mgh, where m is the mass (in kg), g is the gravitational acceleration (9.8 m/s2), and h is the height (in meters).arrow_forwardHow much heat is removed when 100 g of steam at 150◦C is cooled and frozen into 100g of ice at 0◦C. Note that the specific heat of ice is 2, 010 J / kg ·K and the specificheat of liquid water is 4, 186 J / kg ·K.arrow_forward
- This exercise uses Newton's Law of Cooling. A roasted turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 71°F. (a) If the temperature of the turkey is 150°F after half an hour, what is its temperature after 45 min? (Round your answer to the nearest whole number.) oF (b) After how many hours will the turkey cool to 100°F? (Round your answer to one decimal place.) hr thneted be 0.0it 心)arrow_forward(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . The specific heat capacity of water is. Extremely high. If it were much lower, say, oneiiflh as large, what effect would this have on processes such as Fighting fires and cooling automobile engines?arrow_forward(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . According to the First law of thermodynamics, under what conditions would it be possible For a system to absorb heat from its surroundings yet suffer no change in its internalarrow_forward