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An insulated frame wall of a house has an average thermal conductivity of 0.0318 Btu/h-ft^2-R degrees. The wall is 6 in thick and it has an area of 160 ft^2. The inside air temperature is 70 degrees F and the heat transfer coefficient for convection between the inside air and the wall is 1.5 Btu/h-ft^2-R degrees.
On the outside of the wall, the convection heat transfer coefficient is 6 Btu/h-ft^2-R degrees and the air temperature is -10 degrees F. Ignoring radiation, determine the rate of heat transfer through the wall at steady-state in Btu/h
A disk rotates 33.5 times in 75 seconds. What is its period and frequency
Water flows out of a large reservoir through a small pipe that opens to the atmosphere 10 m below the level of the water in the reservoir
a soccer ball is kicked simultaneously by bryan and anthony. bryon kicks with 700 N force to the west while anthony kicks with 800 N force to the north. calculate the net force acting on the ball
A 2.0-kg object is at rest at the top of an inclined plane that makes an angle of 30° with the horizontal and which has a rise of 0.40 m. How much work is done by the object in sliding
Two infinitely long straight and parallel wires carry current in opposite directions of 100 A. The wires are a distance 0.40 m apart and are aligned with the x-axis and lying in the x-y plane with the origin halfway between the two wires
An athlete crosses a 28 m-wide river by swimming perpendicular to the water current at a speed of 0.8 m/s relative to the water, How fast is the water in the river flowing with respect to the ground in m/s
A long solenoid (cross-sectional area = 1.0 x 10-6 m2, number of turns per unit length = 2380 turns/m) is bent into a circular shape so it looks like a doughnut. Find the emf induced in the toroid
A charge of 7 nC is placed uniformly on a square sheet of nonconducting material of side 17 cm in the yz plane. What is the magnitude and direction of the electric field next to the sheet and proximate to the center of the sheet?
The wire in the figure below carries a current of 13 A. Assume that a second long, straight wire is placed right next to this wire. The current in the second wire is28 A. Use Ampere’s law to discover the magnitude of the magnetic field at a distance ..
The smallest object we can resolve with our eye is limited by the size of the light receptor cells in the retina. In order for us to distinguish any detail in an object, its image cannot be any smaller than a single retinal cell. Although the size..
In the order of positive, negative, positive, negative. How much work in joules is required to set up the four charge configuration if q= 1.62pC, a= 77.1cm, and the particles are initially infinitely far apart and at rest?
What is the smallest diameter spot the eye can produce on the retina if the pupil diameter is 4.50mm ? Assume light with a wavelength of = 510nm
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