Vinegar is classified as a mixture. What does this tell you about vinegar? 1Vinegar is made of atoms of one type of element
2Vinegar has a composition that is the same wherever it is found
3Vinegar has two or mores pure substances that can be physically separated
4Vinegar is made of atoms of different elements chemically bonded together

the dependant variable is spilled water

the independent is the heat

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.