A cylindrical block of wood has a cross-sectional area A and weight W. It is totally immersed inwater with its axis vertical. The block experiences pressures $p_t$ and $p_b$ at its top and bottomsurfaces respectively.
Which of the following expressions is equal to the upthrust on the block?
1 )
$({p_b}-{p_t})+A+W$
2 )
${{p_b}-{p_t}}$
$({p_b}-{p_t})+A$
4 )
$({p_b}-{p_t})+A-W$
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