Chapter 3 ForcesSection A Multiple Choice1 A cylindrical block of wood has a cross-sectional area A and weight W. It is totally immersed in water with its axis vertical. The block experiences pressures pt and pb at its top and bottom surfaces respectively.Which of the following expressions is equal to the upthrust on the block?(02s)A (pb - pt)A + WB (pb - pt)C (pb - pt)AD (pb - pt)A - W2 The vector diagram shows three coplanar forces acting on an object at P.
