SC.8.E.5.1 What would be the best unit to describe how big
the universe is?
A)
millions of kilometers
B)
millions of astronomical units (AU.)
C) millions of miles
D) millions of light years (Ly.)

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answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

the answer is 0.42 is that is an option. this question provides no info

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.