Statements
steps of the scientific
method
1. make an observation
a. there is something wrong with the electrical outlet
2. ask a question
b. i plug my coffeemaker into the outlet
3. form a hypothesis
c. why doesn't my toaster work?
4. make a prediction
d. my coffeemaker works when plugged into the outlet
5. conduct an experiment
e. if something is wrong with the outlet, then my coffeemaker also won't work when
plugged into it
6. analyze the results
f. my toaster doesn't toast my bread

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.

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.