1. Reindeer have low energy costs in cold environments because of their a. skin. b. pelage....
Homework Answers
Answer- 1. d. Hypodermis,is a thick fat layer underneath the skin that is about 2 inches thick. This thick layer present subcutaneously helps the reindeer to stay insulated from the cold weather outside and keeps the body warm with increased temperature.
2. c. Fur, 3-4cm thick, a fully grown reindeer has a lot of hair on its body it has hairy skin and the fur is 3-4 cm thick.
3. b. increases dramatically as the air temperature changes from –40°C to –20°C. The resting metabolic rate in adult reindeer increases at a critical lower temperature of about −30°C.
4. b. Oleic acid structure has 18 Carbon atoms with one doulbe bond that makes it monounsaturated with 1 double bond.
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Reindeer have low energy costs in cold environments because of
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a. skin.
b. pelage....
Question 41 Not yet answered Reindeer have low energy costs in cold environments because of their...
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The core is at 37C , skin-fat layer thermal conductivity k_s = 0.3 W/m-K, skin emissivity...
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Question 41 Not yet answered Reindeer have low energy costs in cold environments because of their Points out of 1.00 F Flag question Select one: O a. pelage. O b. hypodermis O c. skin. O d. antlers Question 42 Not yet answered In winter, reindeer is Points out of 1.00 F Flag question Select one: O a. fur; 3-4 cm thick. O b. skin; 3-4 cm thick. O C. skin; 1-2 cm thick O d. fur; 1-2 cm thick. Question...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
The core is at 37C , skin-fat layer thermal conductivity k_s =
0.3 W/m-K, skin emissivity E_s = 0.95, skin-fat thickness l_s = 3
mm, and convection coefficient ℎ_air = 2 W/m2 -K. The jacket has
thermal conductivity of k_j = 0.5 W/m-K, jacket emissivity E_j =
0.02, and jacket thickness l_j = 2 cm.
a) Write two energy balances, one at the skin-jacket interface
and another at the jacket-air interface. Can any of the terms in
your energy balances...
Heat Transfer 1 Problem 1 During a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5°C and the surface temperature of the wall is 12°C, determine (a) friction coefficient at the center of the wall (b) heat transfer coefficient at the center of the wall (c) drag force on the wall (d) the rate of heat loss from on the wall Use Table...
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Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
wam 2 physlet workshe. 13 X Islam 6 1 2 a and b 2nd low * BNG 220 sp20... 1. Air in a piston cylinder device at 300kPa undergoes isobaric compression during which its temperature decreases from 450 K to 375 K. Calculate the amount of heat transfer (in kJ/kg) and work transfer (in kJ/kg) associated with this compression. You may treat air as an ideal gas.
Problem 1 (20 marks): A 1-m x 1-m surface at 100 °C is to be cooled by attaching to it 5-cm long, 0.25- cm-thick square aluminum fins (k = 237 W/m- K), with an edge-to-edge distance between the fins of 0.25 cm. The temperature of the fin tip is the same as surrounding medium at 30°C, und the heat transfer coefficient on the surfaces is 35 W/m2 K. Determine: temperature at distance of 2 cm away from the base the...
Which of the following is/are solution to the wave equation, 1. ei(kx-wt) a. b. (cos kx) (sin ot) sin et C. e sin (kx - t) d. e COs t e. e 2. A building made with a steel structure is 650 m high on a winter day when the temperature is 0° F. How much taller (in cm) is the building when it is 100° F? (The linear expansion coefficient of steel is 11 x 10 (C) ) A...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
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