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The roof of a house consists of a 15-cm-thick concrete slab (k 2 W/m · °C) that is 15 m wide and 20 m long. The emissivity of the outer surface of the roof is 0.9, and the convection heat transfer coefficient on that surface is estimated to be 15 W/m2 · °C. The inner surface of the roof is maintained at 15°C. On a clear winter night, the ambient air is reported to be at 10°C while the night sky temperature for radiation heat transfer is 255 K. Considering both radiation and convection heat transfer, determine the outer surface temperature and the rate of heat transfer through the roof. If the house is heated by a furnace burning natural gas with an efficiency of 85 percent, and the unit cost of natural gas is $0.60/therm (1 therm = 105,500 kJ of energy content), determine the money lost through the roof that night during a 14-hour period.
A hoop and a disk, both of 0.36- m radius and 4.0- kg mass, are released from the top of an inclined plane 3.1 m high and 8.9 m long. What is the speed of the disk
A sinusoid ally vibrating electric charge produces an electromagnetic field traveling in the z direction. The electric field E produced points in the y direction and the magnetic is given with B=0.25sin(5z-3x10^13t)x. Decide E, the amplitude of t..
An automobiletraveling at 80.0 km/h has tires of75.0 cm diameter. How far does the car move during the braking
If alpha particles are caused to fall through a potential difference of 1500 volts, determine their final speed if they were initially at rest. An alpha particle has mass 6.68*10^-27kg and charge of +2e. Alpha particles are Helium nuclei.
Water (? = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0129 m3/s. Calculate the radius of the horizontal pipe
q1. a 130 block on a frictionless table is firmly attached to one end of a spring with 40. the other end of the spring
Choose one between these two: This assignment will be sent through 'safe assign' so no plagiarism please. Present both sides on "abortion vs. the right to life," and b) take a stand on the issue. What are the determinants of population health, and b)..
How much heat must be removed from 0.40 kg of water at 0 degrees C to make ice cubes at 0 degrees C?
q1. assume it takes 7.00 min to fill a 30.0-gal gasoline tank.a. calculate the rate at which the tank is filled in
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.50 m above the pool. What is her velocity when her feet hit the water
A skater holds her arms outstretched as she spins at 150 rpm. What is the speed of her hands if they are 145 cm apart
A person carries a long pole of mass 20 kg and length 3.4 m at the angle of 60 degrees. Find the magnitude of the torque on the pole due to gravity.
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