On a cold day, you grab a piece of metal and a fallen tree limb, both with bare hands. Both have been lying outside for a long time and are at the same temperature. The metal feels colder than the tree limb. Why?
Q: At a local convenience store, you purchase a cup of coffee, but, at 98.4°C, it is too hot to drink.…
A: Given: Initial temperature of coffee T1 = 98.4°C Initial mass of coffee V = 248 mL Give that density…
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A: rectangular cross section of copper spoon = 25 mm ×1.8 mm Heat energy transferred = 40 J Temperature…
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Q: long with a negligible thickness, and assume that the chip radiates heat evenly from both the top…
A: W=1.5cmL=2.5 cmemissivity =0.6E=0.41w
Q: 9) It is the morning of a day that will become hot. You just purchased drinks for a picnic and are…
A: Thermal conductivity is the measure of the ability of a given material to conduct or transfer heat.
Q: A window is 3.01 meters tall and 1.49 meters wide. What is the rate of heat lost if the window is…
A: Given Data:- Height of the window h=3.09 m width of the window is w=1.49 m Thickness of the window…
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A: Introduction : Loose electrons are the outer electrons which are held loosely in the atom.
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Q: What is the final temperature of 269 g of hot coffee initially at 89.0°C if 1.70 g evaporates from…
A: Heat lost by the coffee is equal to the heat gained by the steam. Thus, Here, mC, c, T, ms, and L…
Q: a) If the final equilibrium temperature of the lead pellets and water is 23°C, how many whole…
A: Principle of Calorimetry When two bodies of different temperatures are brought in thermal contact,…
Q: The loss of body heat via convection is described by which statement? The body gives off waves of…
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Q: The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing…
A: The mass of the coffee is m=185 g×1 kg1000 g=0.185 kg The evaporated mass is me=3.93 g×1 kg1000…
Q: after a particularly cold night, Alice leaves a tub of water outside. You may consider the ground…
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Q: #6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski…
A: Given : Buddy,s body temperature, T2 = 306 K Person,s body temperature, T1 = 310 K Surface area of…
Q: You are thinking ahead to spring when one of your friends is having an outdoor wedding. Your plan is…
A: Given: M = mass of lemonade = 5.6 x103 kg = 5600 gm S = specific heat capacity of water = 1.0…
Q: The Moon is Earth's only natural satellite. It has a mass of 7.34 × 1022 kg and is roughly spherical…
A: 7)A=4πr2e=0.9Let moon radius r=1737.4⋅103tQ=eσAT4tQ=σ(0.9)(4π⋅(1737.4⋅103)2)(26)4tQ=8.84⋅1011≈e)…
Q: A pure aluminum plate is part of a heat shield for a manufacturing process. The aluminum plate has a…
A: Step 1:Step 2: Step 3: Step 4:
Q: a)A cube of ice (solid water) of mass m = 0.10 kg at 0 °C is dropped into liquid water M = 1.0 kg of…
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Q: Question 4. A glass windowpane in a home is 0.42 cm thick and of 1.0 m x 2.0 m. On a certain day,…
A: Given: thickness L =0.42 cm =0.42*10-2 mdimensions = 1.0m X 2.0 m; area A = 2 m2indoor temperature…
Q: I set the house temperature to 66 deg Fahrenheit at night time. On a cold morning, I measure the…
A: It depends on the specific heat of the material
Q: Consult Multiple-Concept Example 8 to see the concepts that are pertinent here. A person's body is…
A: The surface area of the body is 1.43 m2. The temperature of the body is 34 °C. The emissivity of the…
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- Consider a 3-m-high, 6-m-wide, and 0.3-m-thick brick wall whose thermal conductivity is k = 0.8 W/m K. On a certain day, the temperatures of the inner and the outer surfaces of the wall are measured to be 14°C and 2°C, respectively. Determine the rate of heat loss through the wall on that day.After exercising, your body gets hot. If you want to cool down, should your exercise clothes be made of a higher material or a lower conductivity? T 9 PrtSc с F5 % 5 T G B F6 6 Y H F7 N F8 * & 7 8 U || M F9 K F10 9 < L F11 0 P *+ F12#6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use num- bers to support your answer (for human skin, you can use the following values: surface area A = 1.50 m², emissivity = 0.970, thickness d= 0.0250 m, thermal conductivty 0.200 ms.K)
- #6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use num- bers to support your answer (for human skin, you can use the following values: surface area A = 1.50 m², emissivity € = 0.970, thickness d = 0.0250 m, thermal conductivty 0.200 ms.K) JBecause water is a much more efficient thermal conductor than air, marine mammals often have thick layers of blubber (under-skin fat, with a thermal conductivity of 0.250 W/(m °C)) and a small surface-to-volume ratio to minimize the loss of energy by heat to the surrounding water. The beluga whale, Delphinapterus leucas, is a species of whale native to the Arctic and sub-Arctic regions. The core body temperature of this whale is usually 37.0°C, and its basal metabolic rate (BMR) is 7.30 x 104 kJ/day. The beluga often finds itself near the Arctic ice sheet, where the water temperature is very close to 0°C. (a) Modeling the body of the whale as a cylinder of length h = 4.10 m and diameter d = 1.20 m,estimate the average thickness (in cm) of the beluga's blubber required to keep the core temperature of the whale fixed at 37.0°C. (For simplicity, treat the blubber layer on the lateral cylindrical surface as a rectangular slab with a constant area. Take the front and rear surfaces of the…The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 205 g of hot coffee initially at 98.0°C if 3.18 g evaporates from it? The coffee is in a Styrofoam cup, and so other methods of heat transfer can be neglected. Assume that coffee has the same physical properties as water; its latent heat of vaporization is 539 kcal/kg and its specific heat is 1.00 kcal/(kg · °C).
- A student is trying to decide what to wear. His bedroom is at 20°C. His skin temperature is 35°C. The area of his exposed skin is 1.50 m². People of all races have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy loss from his body by radiation in 10.0 min.it is important not to undercook chicken, otherwise you might get very sick. The inside of the chicken has to be at a certain temperature (75 C or 165 F) to make sure it is safe. Why can’t you just wait until the outside of the chicken is at this temperature? Why isn’t the entire chicken at the same temperature while it is being cooked?