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The north wall of an electrically heated home is 20 ft long, 10 ft high, and 1 ft thick, and is made of brick whose thermal conductivity is k = 0.42 Btu/h · ft · °F. On a certain winter night, the temperatures of the inner and the outer surfaces of the wall are measured to be at about 62°F and 25°F, respectively, for a period of 8 h. Determine
(a) the rate of heat loss through the wall that night and
(b) the cost of that heat loss to the home owner if the cost of electricity is $0.07/kWh.
An electric utility company supplies a customer's house from the main power lines (115V) with two copper wires, Calculate the power lost in the copper wires
What is in m/s its velocity just before it strikes the floor? What is in m/s its velocity just after it leaves the floor on its way back up?
A model rocket launches with an initial velocity of 7 m/s, at an angle of 81 degrees (with respect to the horizon). How far does the rocket travel in the horizontal direction
An aluminum wire having a cross-sectional area equal to 2.70 10-6 m2 carries a current of 6.50 A. The density of aluminum is 2.70 g/cm3. calculate the drift speed of the electrons in the wire
Two particles with the same charges are held a fixed distance apart. The charges are equal in magnitude and they exert a force on each other. What happens to the force exerted by one charge
Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it
A thin spherical shell of radius 20.0 cm has 5.0 µC of charge uniformly distributed over its surface. What is the electric field 10.0 cm from the center of the sphere
A 2 meter straight wire carrying 5 Amp current runs horizontally and experiences 8 Newton horizontal force while in a 2 T magnetic field. Obtain direction of the magnetic field with respect to horizontal
A 4.94-g bullet is shot through a 0.99-kg wood blocksuspended on a string 2.00 m long. The center of mass of the blockrises a distance of 0.50 cm. Find the speed of the bullet as ite merges from the block if its initial speed is 393 m/s.
A double speed trap is set up on a freeway. One police cruiser is hidden behind a billboard, and another is some distance away under a bridge. How far apart are the two cruisers
Assuming the two cars are locked together, what is the magnitude of their velocity (speed) immediately after the collision?
A parallel plate capacitor by plates of area A and separation, d is imbedded in a large volume filled with a material by electric conductivity σ. Determine the total current, I if the two capacitor plates are maintained at a potential dissimilarity V..
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