For wood and concrete in contact and thermal conducting, determine the temperature profile through the materials using graphical techniques.
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An interior wall of a cold furnace, initially at 0°C, is suddenly exposed to a radiant flux of 15 kW/m2 when the furnace is brought on line. The outer surface of the wall is exposed to ambient air at 20°C through a heat transfer coefficient of 10 W/(m2 K). The wall is 20 cm thick and is made of expanded perlite (k = 0.10 W/(mK), ? = 0.03 × 10–5 m2/s) sandwiched between two sheets of oxidized steel. Determine how long after startup will the inner (hot) sheet metal surface get hot enough so that reradiation becomes significant.
GIVEN • Furnace wall suddenly exposed to radiant heat flux FIND (a) How long before reradiation from the heated wall becomes significant. ASSUMPTIONS (a) Reradiation becomes significant when the reradiated flux from the exposed wall exceeds 10% of the incident radiant flux. (b) The oxidized surface of the exposed wall is black.
An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)
a. 6.1E+3 N b. 2.0E+4 N c. 6.0E+4 N d. 2.6E+4 N e. 6.7E+3 N
In an adiabatic process:
A. the energy absorbed as heat equals the work done by the system on its environment B. the energy absorbed as heat equals the work done by the environment on the system C. the absorbed as heat equals the change in internal energy D. the work done by the environment on the system equals the change in internal energy E. the work done by the system on its environment equals to the change in internal energy
You want to store 1,000 J of energy in an ideal spring when it is compressed by only 2.5 cm. What should be the force constant (spring constant) of this spring?
What will be an ideal response?