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# Tutor profile: Matthew G.

Inactive
Matthew G.
Environmental Consultant at RPS Group
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## Questions

### Subject:Environmental Engineering

TutorMe
Question:

What is the cross-sectional area of a pipe if water flows at a flow rate of 3 (m^3/s) and has a velocity of 1.5 (m/s).

Inactive
Matthew G.

We know Q (flow rate)= V (velocity) * A (cross-sectional area) based on dimensional analysis. By rearranging the equation we can solve for A. 3 (m^3/s) / 1.5 (m/s) = 2 m^2

### Subject:Basic Chemistry

TutorMe
Question:

Determine the number of moles of NaCl in 600 grams of NaCl.

Inactive
Matthew G.

We know the following from the periodic table molecular weight of Na= 22.90 grams/mole molecular weight of Cl is 35.45 grams/mole Adding these together we know the molecular weight is 58.35 grams/mole. So, dividing 600 grams by 58.35 grams/mole is 10.28 moles.

### Subject:Algebra

TutorMe
Question:

Let x be the price of small popcorn and y be the price of soda at the movies. We know 2 small popcorn and one soda is \$10. So 2x + y = \$10 We also know 2 small popcorn and two soda is \$14. So 2x + 2y = \$14 So what is the price of one small popcorn and one soda?

Inactive
Matthew G.

Subtract the second equation by the first as a linear system of equations. 2x+2y = \$14 -(2x+y)= \$10 ---------------------- y= \$4 plugging y=\$4 back into the equation: 2x+y= \$10 we get 2x = \$6. Dividing both sides of the equation by 2 we get x = \$3 We now know one small popcorn (x) is \$3 and one soda (y) is \$4!

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