Question

Stones Weight is 100N Weight of water displaced is 25N What is Buoyancy?

Answer 1

Answer:

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The apparent loss of weight of objects submerged in a liquid. A liquid exerts an upward force on submerged object that is exactly opposite in direction to what gravity exerts. This upward force (or Buoyant force) is the consequence of pressure increasing with depth: i.e., Forces against sides of object are at equal depths and opposite in direction, therefore cancel. Pressure at bottom is greater than pressure at top, since bottom is at a greater depth, therefore the net pressure is upward, thus equal to buoyant force.

Liquid is displaced equal to volume of object submerged in it (this concept can be used to determine the volume of an irregularly shaped objects.

Buoyant force (B.F) = Weight of liquid displaced = Weight density × Volume

Answer 2

$\bold{Weight \: difference =}$

$\bold{150-100 = 50 N = Buoyant \: force \: of \: water}$

$\boxed{ \bold{Buoyant \: Force \: in \: water(Fb) = density \: of \: water x g x volume \: of \: body(Vb)</p><p>}}$

$\rightarrow{ \: 50 = 1000 \times 9.81 \times Vb}$

$\underline{ \bold{Vb = 50/9810 \: cubic \: meter}}$

Now, in air

Weight of body = mg = 150 N

Mass of body,m = 150/9.81 Kg

So,

So, Density of body = m/ Vb

$\: = 150/9.81 ÷ 50/9810$

$\: = 3000 kg \: per \: cubic \: meter$

$\boxed{ \bold{Specific \: gravity \: of \: body = density \: of \: body ÷ density \: of \: water</p><p>}}$

$\: = 3000 ÷ 1000$

Specific gravity of body = 3.