Question 5
The use of a graphing calculator is NOT allowed.
A flat metal plate one centimeter thick is shaped like the first quadrant region under the graph of 
between x = 0 and x = 4. The density of the plate varies; at a distance x units from the y-axis the density is given by x2 grams/cm3.
(a) Assume the approximate mass, ΔM, of a strip of width Δx is:
ΔM = (volume)(density)
Write a left-hand Riemann sum with 4 terms that approximates the total mass of the metal plate.
(b) Write a definite integral that gives the exact value of the total mass of the plate.
(c) Determine the total mass of the plate.
Solution
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