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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.
an airplane is descending at an angle of 20 with respect to horizontal with a speed of 750 kmh when it drops a bomb at
Determines if the member forces are in tension or compression (note that a negative number denotes compression and a position number denotes tension)
A spacecraft used in the exploration of Jupiter has a mass of 425 kg. Find the weight of this spacecraft, in N, (a) on the surface of Jupiter where the acceleration of gravity is 25.94 m/s2 and b) on earth where the acceleration of gravity is 9.81 m/..
A vertically mounted piston-cylinder device contains 1.5 kg of water and is being heated over a coal burning stove. During the process, 75 kJ of heat is transferred to the water and heat losses from the side walls amount to 9 kJ.
1 when a computer is turned off its cpu begins to cool off. imagine that the internal energy of the cpu is given by u
in a paint plant semiautomatic mixers are normally used. it takes 8 minutes for an operator to load a mixer with the
the ram of a pile driver has a mass of 800 kg and is released from rest 2 meters above the top of a 2400 kg pile. the
Estimate the Schmid Factor, which is used to convert the CRSS into a critical tensile 'yield' stress. Use the measured angle between the slip trace and the sample long axis
For a pump in the basement which must deliver water to a bucket on the floor of the upper mechanical room, what is the minimum pressure in psig you will see at the pump discharge.
an irrigation pump is used to draw water from a reservoir and deliver it to an irrigation ditch at a mass flow rate of
find the response of a generic undamped spring-mass system subjected to a square pulse ftf0 for 0letltt0 and 0 for
A piston cylinder device contains .733 kg of refrigerant-134a at -10 degrees C. The piston that is free to move has a mass of 8.63 kg and a diameter of 21.2 cm. The local atmospheric pessure is 88 kPa. Now, heat is transferred to the refridgerant-134..
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