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A 20 cm diameter sphere is made of a heat-generating material that produces 10^6 W/m3. The sphere is cooled by 20oC air with a convection heat transfer coefficient of 100W/m^2*K?. What is the sphere's surface temperature?
Calculate the concentration of vacancies in Pb at its melting temperature of 327oC. Assume an energy for vacancy formation of 0.55 eV/atom. Lead has an atomic weight of 207.2 g/mol and a density of 11.35 g/cm3.
Water is pumped from a lake at ambient pressure
estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation
a 250 mm bar of 15mm x 30 mm rectangular cross-section consists of two aluminum layers which are 5 mm thick each brazed
as shown in the figure steam at 1200 psia 825degf enters a turbine operating at steady state with a volumetric flow
consider an nhl regulation hockey puck 3 inches in diameter and 1 inch thick 7.62 cm by 2.54 cm. determine the surface
communication satellites are placed in a geosynchronous orbitthat is in a circular orbit such that they complete one
While jogging on the beach (it's a warm summer day, about 30 deg C) a high-speed jet flies overhead. You guesstimate it's an altitude of about 3500 m, and count off about 5 s before you hear it. Estimate the speed and Mach number of the jet.
a vertical bar ed has a circular cross-section and is fixed at e. member abc is a single member that lies on the
To determine the heat transfer characteristics of a cylinder under cross flow conditions when the cylinder is isolated.
question a person of weight 100 kg standing on skis 2 m long and 0.10 in wide slides on the 2deg mountain slope at
why are tangent points so important when sketching, drawing on paper with instruments, or using cad?
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