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A 4-m high and 6-m wide wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k = 0.72 W/m ·°C) separated by 3-cm-thick plaster layers (k = 0.22 W/m ·°C). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m ·°C) on the inner side of the wall. The indoor and outdoor temperatures are 22 °C and -4 °C, and the convection heat transfer coefficients on the inner and outer sides are 10 W/m2 ·°C and 20 W/m2 ·°C, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.
a platform of weight 200 lb supported by two springs each of constant k 250 lbin. is subjected to a periodic force of
a 1.5 ton crate is hoisted by three steel wires. each wire is 1/4 in. in diameter and each carries one-third of the load. determine the stress in the wires.
Midrange and amplitude components, A shaft is subjected to a completely reversed bending stress such that Xmax=40kpsi and Xmin=-40kpsi
three kg of water in a piston-cylinder apparatus is initially in the saturated liquid state at 0.6 mpa. energy is added
the air inside a chamber at 54 c is heated convectively with heat transfer coefficient of 35 wm2k by a 0.29-m thick
a 5-ton elevator is supported by a standard steel cable of 25 in2 cross section and an effective modulus of elasticity
determine the expressions for attractive and repulsive energies, EA and ER as a functions of r where r is in nm and E is in eV.
a ship tracks an unmanned vehicle p in the water. relative a reference frame the recorded motion of p for the first t
a cantilevered bar is 500 mm long with square cross section 25mm x 25 mm. three perpendicular forces are applied to its
a pickup truck has a five liter four stroke cycle v6 si engine operating at 2400 rpm. the compression ratio rc10.21 the
consider a cylindrical specimen of some hypothetical metal alloy that has a diameter of 8.0 mm 0.31 in.. a tensile
a mini motor bike for chidren is powered by a 4 hp single cylinder gasoline engine governed to run at a maximum of 2250
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