The temperature at a point 50 km north of a station is 3°C cooler than at...
The temperature at a point 50 km north of a station is 3°C cooler than at the station. If the wind is blowing from the northeast at 20m/s and the air is being heated by radiation at the rate of 1.5°C/h, what is the local temperature change at the station? (hint: use the thermodynamic energy equation)
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The temperature at a point 50 km north of a station is 3°C
cooler than at...
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 1...
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 10°C. 1) Calculate the avg. heat transfer coefficient along the 10 m width of the wall. 2) Calculate the local heat transfer coefficient at a location 10 cm from the leading edge of the wall. (25pts)
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C...
2. An airplane is heading due north at an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use vectors to work out how far off course the plane i...
2. An airplane is heading due north at an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use vectors to work out how far off course the plane is blown, and what its ground speed is. (a) Write down a vector, p, that represents the intended flight path of the plane in one hou. (b) Write down a vector, w, that represents the movement of a particle caught in...
An airplane is heading due north at a constant height with an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use two-dimensional vectors to wor...
An airplane is heading due north at a constant height with an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use two-dimensional vectors to work out how far off course the plane is blown, and what its ground speed is. (a) Write down a vector, p, that represents the intended flight path of the plane in one hour. (b) Write down a vector, w, that represents the movement of...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature of the wire is T.-11.0°C during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 40 km/h, which is the heat loses in one kilometer of transmission line. Air properties: p= 1.246 kg/m”, k = 0.02439 W/m. C, u=1.426x10* mºis, Pr = 0.7336 Wind, 40 km/h 100/14 Transmission lines
AHS 375-Homework 11 Due: 2 October 2019 30 Sep 2019 1. Show that pressure decreases more...
AHS 375-Homework 11 Due: 2 October 2019 30 Sep 2019 1. Show that pressure decreases more rapidly with height in a cold layer of air than in a warm layer. Hint: start with hydrostatic balance and make use of the ideal gas law. 2. Use the hypsometric equation to determine how much the mean virtual temperature of the 1000 hPa to 850 hPa layer would change if the thickness of the layer decreased by 20 m. Would the mean virtual...
Thermal Storage Solar heating of a house is much more efficient if there is a way...
Thermal Storage Solar heating of a house is much more efficient if there is a way to store the thermal energy collected during the day to warm the house at night. Suppose one solar-heated home utilizes a concrete slab of area 11 m2 and 26 cm thick. If the density of concrete is 2400 kg/m3, what is the mass of the slab? The slab is exposed to sunlight and absorbs energy at a rate of 1.2 ×107J/h for 10 h....
A car travels at a constant velocity of 90 km/h along an expressway under-ambient temperature and...
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
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[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
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Please help solve these parts. Thanks After leaving the furnace at temperature 900°C, steel balls of...
Please help solve these parts. Thanks
After leaving the furnace at temperature 900°C, steel balls of radius 1.5 cm are being placed in a moving belt of speed u=1 cm/s and cooled slowly in air (Too = 30°C, h = 100 W/m²K); these balls are then collected Furnace Air, 35°C after moving a distance of L = 4.5 m. Choose steel: ks = 900°C 50 = 0.465 kg.K Air: ka = 0.025 Pa = 1.2800 kg,ca = 0.718 k] The...
A long wire with circular cross section and diameter D = 1 mm is submerged in an oil bath with temperature To 20。C. The wire is initially at temperature T = 20。C, the same temperature as the oil. A...
A long wire with circular cross section and diameter D = 1 mm is submerged in an oil bath with temperature To 20。C. The wire is initially at temperature T = 20。C, the same temperature as the oil. A current is passed through the wire, resulting in a volumetric heat generation of q - 1.5 x 108 W/m3. The convection coefficient is h - 500 W/m2 - K, and the properties of the wire are ρ-8000 kg/m3, Cp-500 J/kg-K, and...
o) thes at2ciency of 0.22 and delivers 180 J of work per cycle (c) If the...
o) thes at2ciency of 0.22 and delivers 180 J of work per cycle (c) If the energy content gasoline 010 A four-cylinder gasoline engine has acper s (a) thework done per second, and (b) the total heat input per second from icieney ord 1500 pm) has an et nt of gasoline is 130 MJ per gallon, how long is 130 MJ per gallon, how long does one gallon last? 011. rool ch initial sed of 4.0 ms' slides along a...
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 10°C. 1) Calculate the avg. heat transfer coefficient along the 10 m width of the wall. 2) Calculate the local heat transfer coefficient at a location 10 cm from the leading edge of the wall. (25pts)
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C...
2. An airplane is heading due north at an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use vectors to work out how far off course the plane is blown, and what its ground speed is. (a) Write down a vector, p, that represents the intended flight path of the plane in one hou. (b) Write down a vector, w, that represents the movement of a particle caught in...
An airplane is heading due north at a constant height with an airspeed of 950 km/h, but there is a constant wind blowing from the northeast at 100 km/h. We will use two-dimensional vectors to work out how far off course the plane is blown, and what its ground speed is. (a) Write down a vector, p, that represents the intended flight path of the plane in one hour. (b) Write down a vector, w, that represents the movement of...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature of the wire is T.-11.0°C during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 40 km/h, which is the heat loses in one kilometer of transmission line. Air properties: p= 1.246 kg/m”, k = 0.02439 W/m. C, u=1.426x10* mºis, Pr = 0.7336 Wind, 40 km/h 100/14 Transmission lines
AHS 375-Homework 11 Due: 2 October 2019 30 Sep 2019 1. Show that pressure decreases more rapidly with height in a cold layer of air than in a warm layer. Hint: start with hydrostatic balance and make use of the ideal gas law. 2. Use the hypsometric equation to determine how much the mean virtual temperature of the 1000 hPa to 850 hPa layer would change if the thickness of the layer decreased by 20 m. Would the mean virtual...
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
coefficient is 0.22.
[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
any energy contained in the exhaust gases and any...
Please help solve these parts. Thanks
After leaving the furnace at temperature 900°C, steel balls of radius 1.5 cm are being placed in a moving belt of speed u=1 cm/s and cooled slowly in air (Too = 30°C, h = 100 W/m²K); these balls are then collected Furnace Air, 35°C after moving a distance of L = 4.5 m. Choose steel: ks = 900°C 50 = 0.465 kg.K Air: ka = 0.025 Pa = 1.2800 kg,ca = 0.718 k] The...
A long wire with circular cross section and diameter D = 1 mm is submerged in an oil bath with temperature To 20。C. The wire is initially at temperature T = 20。C, the same temperature as the oil. A current is passed through the wire, resulting in a volumetric heat generation of q - 1.5 x 108 W/m3. The convection coefficient is h - 500 W/m2 - K, and the properties of the wire are ρ-8000 kg/m3, Cp-500 J/kg-K, and...
o) thes at2ciency of 0.22 and delivers 180 J of work per cycle (c) If the energy content gasoline 010 A four-cylinder gasoline engine has acper s (a) thework done per second, and (b) the total heat input per second from icieney ord 1500 pm) has an et nt of gasoline is 130 MJ per gallon, how long is 130 MJ per gallon, how long does one gallon last? 011. rool ch initial sed of 4.0 ms' slides along a...
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