Which of the following statements is the best description of Natural Resources? A) Renewable resources and nonrenewable resources are boring.

B) Natural resources cannot be classified as renewable resources.

C) Natural resources can be classified as renewable and nonrenewable resources.

D) Natural resources cannot be replaced at the same rate in which the resource is used, no matter what.

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.

it was spontaneous.

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