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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.
one cue your hearing system uses to localize a sound is the slight difference in the arrival times of the sound at year ears. what is the difference in arrival times
A 0.600 mole sample of an ideal gas is at a temperature of 303 K at atmospheric pressure. Calculate the volume occupied by the gas
The figure below shows a resistor of resistance R = 6.16Ω connected to an ideal battery of emf = 14.9 V bymeans of two copper wires. Each wire has length 23.2 cm and radius3.40 mm. In dealing with such circuits in this chapter, wegenerally neglect..
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 65.0o. Dog A exerts a force of 254N, and dog B exerts a force of 296N. Find the angle the resultant force makes with the rope of dog
The child then proceeds to walk toward the edge of the merry-go-round. Illustrate what is the angular speed of the system when the child reaches the edge?
A 10,000 kg empty railroad car moving at 3 m/s collides with a loaded railroad car weighing 196,000 N and couples with it
According to the shop manual, when drilling a 11.8mm--diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1400 rev/min. Find the maximum radial acceleration of any part of the bit
A flywheel is initially rotating at 20 rad/s and has a constantangular acceleration. After 9.0 s it has rotated through 450 rad. Its angular acceleration is:
A bomb at rest at the origin of an xy-coordinate system explodes into three pieces. Just after the explosion, one piece, of mass m, moves with a velocity of 13 m/s in the negative x-direction, what is the magnitude of the velocity of the third piec..
a point charge of -2.03oc is located in the center of a spherical cavity of radius 6.52cm inside an insulating
Two narrow slits are utilized to produce a double-slit interference pattern with monochromatic light (λ = 680 nm). The slits are separated by 0.70 mm, and the interference pattern is projected onto a screen 5.5 m away from the slits.
Components dropping 10, 20, 30, and 50 volts what is the V applied. What is the algebraic sum of the voltages around a closed loop
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