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A civil engineer builds a solid door with dimensions 2.00 m x 0.95 m x 5.0 cm. Its thermal conductivity is k = 0.120 W/m.K. The air films on the inner and outer surfaces of the door have the same combined thermal resistance as an additional 1.8 cm thickness of solid wood. The inside air temperature is 20.0oC, and the outside air temperature is -8.0oC.
(a) What is the rate of heat flow through the door?
(b) By what factor is the heat flow increased if a window 0.50 m on a side is inserted in the door? The glass is 0.450 cm thick, and the glass has a thermal conductivity of 0.80 W/m.K. The air films on the two sides of the glass have a total thermal resistance that is the same as an additional 12.0 cm of glass.
A water pipe having a 2.8 cm inside diameter carries water into the basement of a house at a speed of0.92 m/s and a pressure of166 kPa. The pipe tapers to1.9 cm and rises to the second floor7.9 m above the input point.
A hydrogen atom at rest in the laboratory emits the Paschen ? radiation. Compute the recoil kinetic energy of the atom
Examining your image in a convex mirror whose radius of curvature is 25.8 centimeter, Obtain where is the image of your nose located
A 2.1-cm-diameter metal sphere is glowing red, but a spectrum shows that its emission spectrum peaks at an infrared wavelength of 2.2 µm. How much power does the sphere radiate
Would the force change if we instead remove the charge in the larger sphere where the ball is? So now we are looking at the force on the ball due to the sphere with a cavity carved out, which is a more realistic scenario.
Two identical carts travel at 1m/s in opposite directions on a common horizontal surface. They collide head-on and are reported to rebound, each with the speed of 2m/s.
One cylinder in the diesel engine of a truck has an initial volume of 600 cm3 . Air is admitted to the cylinder at 35 °C and a pressure of 1.0 atm. The piston rod then does 400 J of work to rapidly compress the air.
A pitcher throws a curveball that reaches the catcher in 0.59 s. The ball curves because it is spinning at an average angular velocity of 380 rev/min on its way to the catcher's mitt. What is the angular displacement of the baseball as it travels ..
the positron is a particle with the same mass as an electron but charge e. a positron in a bubble chamber moves
How far away is the Milky Way from our nearest neighbour, Andromeda Galaxy, if Andromeda contains roughly the similar number of stars and attracts the Milky Way with a gravitational force of 2.4 x 10^30 N.
Minke whales (Balaenoptera acutorostrata) are relatively small baleen whales which feed on krill. Given the picture below and the information that whale is 6 m long, and has an average diameter of 1.0 m, form a model for the whale which allows you to..
A ceiling fan with 60 centimeter diameter blades is turning at 65 rpm. Determine through how many revolutions does that fan turn while stopping
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