Question $1(1$ point$)$

The upward force on the log is:

$(r^2-\frac{1}{4}{r}^2)g$ ength

$(r^2+\frac{1}{4}{r}^2)g$ length

$2(r^2-\frac{1}{4}{r}^2)g$ length

$2(r^2+\frac{1}{4}{r}^2)g$ length

$0$