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The electric reheating oven shown in the figure is used to heat a continuous sheet of metal from 25-1000C The metal speed is such that the strip of metal spends 2 hours inside this oven, The sheet thickness is 1cm and the ambient temperature is 25C with the temperature of the outside of the oven a uniform 50C. Inside the oven use a convection = 20 W/m^2*k and the metal sheet is 304 ss. Calculate the electric power input to the oven per unit oven width; q'. What percentage of this power is lost by convection to the outside air?
assume that the velocity v of fall of an object depends on the height h through which it falls the gravity g and the
water flowing through a 10-cm-diameter water pipe at a rate of 0.1 m3s. now a diffuser with an outlet diameter of 20
a 10 gram mass is attached to the end of a 2 meter string which is perfectly flexible infinitely strong and weightless.
to determine the viscosity of a liquid of density 948 kgm3 you fill to a depth of 12 cm a large container whichdrains
1. what are rupture disks under the relief valves? what if there is a pin hole leak under a rupture disk?2. what are
mr. john is considering two machines to purchase for his company. machine x will have a first cost of 80000 an
The humidity of air can be determined by use of two different thermometers; a 'dry bulb' thermometer and a 'wet bulb' thermometer. explain how these thermometers can be used to estimate the amount of water vapour in the air.
air flows through a converging adiabatic duct with no loss. the temperature at the inlet is 400 k. at the outlet the
determine the force and moment reactions at the support A of the built in beam which is subjected to the sine-wave load distribution.
two 455000-lb locomotives pull 58 230000-lb coal hoppers cars. the train starts from rest and accelerates uniformly to
Determine the required length L of each splice if a factor of safety is 2.75.
consider steady heat transfer through a 5m x 6m brick wall of a house of thickness 30 cm. on a day when the temperature
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