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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible expla- nation for this situation (with supporting calculations) by considering a room whose air temperature is main- tained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the sum- mer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a tempera- ture of 32°C throughout the year and to have an emis- sivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2 · K.
A hollow cylinder made of copper has an outer diameter of 200 mm, an inner diameter of 50 mm and a height of 100 mm. Under load P the final height of the cylinder is 60 mm and the inner diameter is 45 mm. If the strength coefficient K is 315 Mpa and ..
argon in the amount of 0.6 kg fills a 0.05 m3 piston cylinder device at 550 kpa. the piston is now moved by changing
a composite wall consists of a 13-mm-thick inner plaster board a 192-mm-thick fiberglass blanket insulation and a
a punching machine is driven by a motor which exerts a constant torque on the flywheel at a mean speed of 2 revs. if
water behind a dam enters an intake pipe at a pressure of 1.05 bar and velocity of 1 ms flow through a hydraulic
Describe the four incorrect assumptions concerning robot - arm movement that are most frequently responsible for impact accidents.
Steam enters a diffuser at and with a velocity of and exits as saturated vapor at 240 F and 100 ft/s. The exit area of the diffuser is 1 ft2. Determine the mass flow rate of steam and the rate of entropy generation.
calculate the average distance moved in one day by smoke particles in air for the following cases a smoke diffuses in
determine the number of vehicles needed to satisfy the indicated deliveries per hour? Assume that availability = 0.90.
What is the heat flux through the plates? What is the temperature drop across the contact plane?
An automobile weighing 2500 lbf increases its gravitational potential energy by 2.25x10^4 Btu in going from an elevation of 5183 ft in Denver to the highest elevation on Trail Ridge Road in the Rocky Mountains. What is the elevation at the high point..
one cubic foot 1 ft3 of air is contained in a piston - cylinder arrangement. the axis of the cylinder is oriented in
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