Acarpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of styrofoam insulation 2.4 cm thick on the inside wall surface. the wood has k=0.080w/(m? k), and the styrofoam has k= 0.010 w/(m? k). the interior surface temperature is 20.0 ? c , and the exterior surface temperature is -13.0 ? c

a.) what is the temperature at the plane where the wood meets the styrofoam? celsius
b.) what is the rate of heat flow per square meter through this wall? /m^2

A. T=15.54 °C

B. Q/A= 0.119 W/m2

Explanation:

To solve this problem we need to use the Fourier's law for thermal conduction:

Here, the rate of flow per square meter must be the same through the complete wall. Therefore, we can use it to find the temperature at the plane where the wood meets the Styrofoam as follows:

Then, to find the rate of heat flow per square meter, we have:

the answer is a. hope this .

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft