1. A concrete block rests on the bottom of a lake. The block is a cube, 1 f t on a side. Calculate...

Question

1. A concrete block rests on the bottom of a lake. The block is a cube, 1 f t on a side. Calculate the force required to hold the block at a fixed depth. The density of concrete is 2400 kg/m³ .

2. A cube of an unknown material measuring h per side has a weight Mg in air, and an apparent weight of Mg/³ when fully submerged in water. Find the specific gravity of the material.

David · Accepted Answer

a) If we apply the FD on the block we find the block's weight poiting downward and the upward 
bouyant force that must be equal to the block's weight to keep it still 
W-B=0 
B=W=mg=rho*v*g=2400*0.3048^3*9.8=666.

1. A concrete block rests on the bottom of a lake. The block is a cube, 1 f t on a side. Calculate the force required to hold the block at a fixed depth. The density of concrete is 2400 kg/m 3 . 2. A...

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