The weight of a block of unknown material is N when measured in air. When you dr
ID: 1392507 • Letter: T
Question
The weight of a block of unknown material is N when measured in air. When you drop the block in water, it floats at the surface. What is the buoyant force on the block? 0N Less than N but not 0 N Exactly N Greater than N Two identical balloons filled with air are held underwater, one at a depth of 3 m and the other at a depth of 9 m. How do the pressures felt by the balloons compare? The balloon at a depth of 9 m will feel twice as much pressure as the other balloon. IE The balloon at a depth of 9 m will feci three times as much pressure as the other balloon.Explanation / Answer
weight of the block in air = W = D_b*V*g
the buoyancy force is equal to the weight of the displaced liquid
Fb = D_w*V**g
D_w < D_b
density of water is less then the density of block
so buoyancy force Fb is less then the weight of the block in air
D_w = density of water is not zero, so buoyant force cannot be zero
option B
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Q 10)
guage pressur at a depth h from the surface = P = D_w*g*h
for balloon at a depth of 3m P1 = D_w*g*3
for ballOon at a depth of 9m P2 = D_w*g*9
p2/p1 = 3
The balloon at a depth of 9m will fell three times as much pressure as the other balloon
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