(¦ 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_forwardSolve the following problem. Round off the final answer to three decimal places. A popular web site state that a 200 pound person will burn 450 calories/hour bicycling (moderate effort) and 650 calories/hour rock climbing (ascending). A 150 pound person decides to start a training routine in which she will bicycle for 45 minutes, 3 times a week and rock climb for 1.50 hours every weekend. How many calories will she have burned after 8 weeks of training (assuming she consumes at the same rate)?arrow_forward
- Some amount of heat energy is removed from a 9cm X 26cm X 46cm block of ice to cool from 0ºC to -26ºC. (Hint: to find mass, use the relation between, density, mass and volume) Calculate the following: a) The mas of ice cube in grams (density of ice = 920 kg/m3). b) The temperature difference in kelvin b) The energy removed from ice in calories . (specific heat of ice = 2093 J/kgºC)arrow_forwardOnly about 20% of the Calories we consume are used for mechanical work (i.e., moving the body around). Estimate how many granola bars (150 Cal per bar) an 85 kg person will burn if they climb vertically up theside of the Empire State Building. height of Empire State Building, h = 443 m unit conversion: 1 Cal = 4184 Joulesarrow_forwardAn energetic athlete can use up all the energy from a diet of 4000 Cal/day. If he were to use up this energy at a steady rate, what is the ratio of the rate of energy use compared to that of a 100 W bulb? (The power of 100 W is the rate at which the bulb converts electrical energy to heat and the energy of visible light.)arrow_forward
- Some amount of heat energy is removed from a 5cm X 12cm X 37cm block of ice to cool from 0ºC to -24ºC. (Hint: to find mass, use the relation between, density, mass and volume) ((a*2)+(b*1)+(c*2) = 5marks) Calculate the following: a) The mas of ice cube in grams Answer for part 1 (density of ice = 920 kg/m3). b) The temperature difference in kelvin Answer for part 2 b) The energy removed from ice in calories Answer for part 3 . (specific heat of ice = 2093 J/kgºC)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_forwardAn 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_forward
- In 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_forwardAn interesting problem came up in my research a few weeks ago, and today you will help me solve it! When discussing the change of temperature in a body, one uses the equation: Where Q is the heat (energy) transferred, c is the specific heat of the substance, m is the mass of the substance, and is the change of temperature due to the energy transfer. When I bombard a material with an ion beam, I transfer heat to it through the means of scattering. In my research, I would like to bombard liquid water with an ion beam! Suppose I have 3.45 * 10-13 grams of liquid water, with a specific heat of 4.184 J/gK, and I bombard it with an ion beam with an energy of 10 MeV or 1.602 * 10-12 J. Suppose the water absorbs all the energy of the ion beam, what would be the temperature increase of the sample for each ion bombarded?arrow_forwardAsaparrow_forward