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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 dc motor is connected to a constant emf of 13.9 V. The resistance of its windings is 2.0 ?. What current does it draw at normal operating speed
q1. a plane speeds up from 42 meters per second to 155meters per second in 57 seconds. establish an average
A container is filled to the brim with 1.4 L of mercury at 20°C. As the temperature of the container and mercury is increased to 50°C, Determine the linear expansion coefficient of the material
A charge of q = +10-7 C is uniformly distributed on a spherical shell of radius 12 cm. What is the electric potential at the center of the shell
A 20 kg sled is being pulled along a horizontal stretch of snow covered ground by a horizontal force of 30 N. find the coefficient of kinetic friction between the sled and the snow
A guitar string produces 4 beats per second when sounded with a 350-Hz tuning fork and 9 beats per second when sounded with a 355-Hz tuning fork. What is the vibrational frequency of the string
projectile motion horizontal only1. a rifle is fired horizontally 9 meters above the ground. the bullets velocity is
an object is at a distance d to the left of a flath screen. A converging lens with focal length f
Consider the collision between two hockey pucks in the figure below. They do not stick together. What is the final velocity of the other puck
The Andromeda galaxy is at a distance of 2.1 X 1022 m from our Galaxy. The mass of Andromeda is 6 X 1041 kg and the mass of our Galaxy is 4 X 1041 kg. What is the acceleration of our Galaxy
A simple pendulum is made from a .65 m long string and a small ball attatched to it its free end. how much time elapses before it gains the greates speed
A solid wheel (solid cylinder) with mass 2.5 kg and a radius of 0.50 meter starts rotating from rest and has a constant angular acceleration of 2.5 radians/second^2 Determine the torque required to produce this motion
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