4.20. find the particular solution to the heat equation on a rod x 2 [0; p] with d = 1, and zero-temperature endpoints with a source r=kc = sin(x) and initial condition f (x) = 2sin(x).

The vector a? is 3.50 cm long and is directed into this page. vector b? points from the lower-right corner of this page to the upper-left corner of this page and has the components bx=-19.5 cm , by=25 cm. in the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page, and +z-axis out of the page, find the x-component of the vector product a? ×b? , measured in cm2.