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Your answer for part b is incorrect. I think you inputted the rhoHg incorrectly.

(13.6X10^3)(9.8)(-0.042) = 98402.24 N/m^2

(13.6)(9.8)(-0.042) = 103994.40 N/m^2

Methodology is correct though! =) Thanks so much for doing this!!

I agree! Part b was done incorrectly. Please fix whenever possible.

The textbook denotes the answer as 9.8 x 10^4 Pa

Hi rohanblazers, thanks for reminding me about this error. You're correct that the part b) answer is $9.8 \times 10^4 \textrm{ Pa}$. I'm away from my recording equipment at the moment, but I'll make a note in the quick answer that the working in the video is correct, but I forgot to include the $\times 10^3$ after the $13.6 \textrm{ kg/m}^3$ when plugging into my calculator for the final answer.

All the best,
Mr. Dychko