Answer
The tension in the rope is $~~1910~N$
Work Step by Step
In part (a), we found that the downward force on the cube due to pressure is $3.71\times 10^4~N$
In part (b), we found that the upward force on the cube due to pressure is $3.96\times 10^4~N$
We can find the tension $F_T$ in the rope:
$F_T+(3.96\times 10^4~N) = mg+(3.71\times 10^4~N)$
$F_T = (450~kg)(9.8~m/s^2)+(3.71\times 10^4~N)-(3.96\times 10^4~N)$
$F_T = 1910~N$
The tension in the rope is $~~1910~N$
