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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 6 ft. diameter sphere floats half-submerged in seawater. what mass of concrete is required as an external
A cable drum for a crane is to rotate between 160 and 166 rpm. Design a gear drive for 25 hp in which the input pinion rotates at 925 rpm and the output rotates with the drum. The crane is expected to operate with a 50% duty cycle for 120 hours per w..
Determine the force in the hydraulic cylinder AB and the magnitude of the pin reaction at O for the position shown. The bucket and its load have a combined weight of 4000 lb with center of gravity at G. You may neglect the effect of the weights of..
a bearing steel with 1.2 wt. c is analyzed for its microstructure after annealing heat treatment. a write down the
Allowing for convection to ambient air, with T00 = 20°C and h = 15 W/m2 · K, and radiation exchange with large surroundings (s = 0.4, Tsur = 20°C), determine the instantaneous rate of melting during irradiation.
Calculate the overall heat transfer coefficient (U) for the assumed tube diameter, fin shape and material. Use correlations to estimate hot-and cold-side convection coefficients, conduction resistance, contact resistance (if any), and fouling resi..
1. Assume a vertical pipe and include gravity in the list of variables in Prob. 6.12 and ?nd an expression for the pressure drop. 2. The drag force on a sphere depends on the sphere's diameter and velocity, the ?uid's viscosity and density, and g..
a 316 in. thick acrylic testing box with dimensions of 10.0 in. x 10.0 in is covered with an unknown 0.50 in.
sheet steel emerging from the hot roll section of a steel mill has a temperature of 120 k a thickness of delta 3mm and
in a chain link fencing machine if we are using 2mm gi wire at the feed of 10mm per second through a self centering
nerve impulses travel at different speeds depending on the type of fiber through which they move. the impulses for
a carnival ride is designed to allow the general public to experience high-acceleration motion. the ride rotates about
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