Question

A rectangular tank is moving horizontally in the direction of its length with a constant acceleration of 4.8 m/s^2. The length of tank is 7 m and depth is 1.5 m. If tank is open at the top then calculate the maximum pressure intensity at the bottom.

(a) 6.3 N/cm^2

(b) 3.15 N/cm^2

(c) 12.6 N/cm^2

(d) 1.6 N/cm^2

The question was asked in an interview for job.

The above asked question is from Pressure Distribution in a Liquid topic in division Hydrostatic Forces on Surfaces of Fluid Mechanics

Answer 1

Correct choice is (b) 3.15 N/cm^2

The best I can explain: tanθ=a/g

                     tanθ=4.8/9.8

                          θ=26.07⁰

h= d+(L/2)tanθ

  = 1.5+3.5tan26.07

  = 3.21 m

p=ρ*g*h

  =3.15 N/cm^2.