A company claims that one of their antacid tablets contains 0.400g of calcium. A student did
an experiment to measure the amount of calcium
in a single tablet, which came out to be 0.365g.
What is the percent error in the student's
measurement?
А
B
8.8%
9.6%

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.