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- anonymous

The solution to Problem 3, PSet 10 contains errors and inconsistencies. The problem states that the curve of the trough is given by z=(1/100)x**4, but the lower limit for the integral is given as (1/81)x**4. The length of the trough is stated as 200m, but the picture shows a length of 300m and the solution uses a length of 100m. Finally, the density of water is listed as 1kg/m*3. The solution uses 1000kg/m*3. Note that kg, not g are the correct units for finding energy in joules.

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- anonymous

- jamiebookeater

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- phi

yes, both the question and answer are a mess.
if z goes to 81
we get nicer x values using z= x^4/81
(x= -9 to +9)
and who knows what the length is.
further, evaluating the iterated integral given in the solution, I get 1.14e9 J which does not match the quoted result of 5.14e10 Joules.

- baru

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