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A 50 mm diameter pipe of circular cross-section and with walls 3 mm thick is covered with two concentric layers of lagging, the inner layer having a thickness of 25 mm and thermal conductivity of 0.08 W/(m.K), and the outer layer having thickness of 40 mm and a thermal conductivity of 0.04 W/(m.K). Estimate the rate of heat loss per metre length of pipe if the temperature inside the pipe is 550K and the outside surface temperature is 330K. Thermal conductivity of pipe = 45 W/(m.K).
A freezer is used to freeze 3.0 Lof water completely into ice. The water and the freezer remain at aconstant temperature of T = 0°C. Determine the change in the entropy of the water
The closed tank with a hemispherical dome is filled with water and a U-tube manometer with a SG2=3 liquid is connected to it. Calculate the vertical force on the dome for R=4 ft, h1=2 ft, h2=2 ft, h3=5 ft and PA=12.6 psia.
If a curve with a radius of 60 meters is properly banked for a car traveling 60 km/hr, what must the coefficient of friction be for a car on the same curve traveling 90 km/hr.
How long must a 0.60 mm diameter silver wire be to have a 0.56 A current when connected to the terminals of a 1.5 V flashlight battery
a mass m1 7.98kg is at rest on a frictionless horizontal surface and connected to a wall by a spring with k 64.6 nm. a
Two point charges have a total charge of 560 µC when placed 1.10m apart. The force each exerts on the other is 22.8N and is repulsive. What is charge on each other
A 20 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0°C is 331 m/s. What is the wavelength of the fundamental frequency
Two charged bodies exert a force of .145N on each other. If they are now moved so they are one fourth as far apart, what force is exerted.
A fighter jet is launched from an aircraft carrier with the aid ofits own engines and a steam-powered catapult. The thrust of itsengines is 3.44 x 105 N. In being launched from rest itmoves through a distance of 59.7 m and has a kinetic energy of 7..
Now the dipole is brought into the field of a fixed point charge Q. which is at distance r from +q and distance (r + d) from q. We observe that the dipole accelerates towards Q. Is Q positive or negative?
Does a tile floor feel colder than the area rug covering it? Describe why it is better to wear mittens than gloves on a cold day. Why is it better to wear several layers of clothing than one coat of equal weight?
consider a carousel 32 feet in diameter. this carousel takes 11 s to accelerate from rest to its operating speed of
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