A solid glass sphere weighs 20N in air and 16N in water. the specific gravity of glass is?
Answers
Answer:
Weight difference =
20-16 = 4 N = Buoyant force of water
Buoyant Force in water(Fb) = density of water x g x volume of body(Vb)
4= 1000 x 9.81 x Vb
Vb = 4/9810 cubic meter
Now, in air
Weight of body = mg = 20 N
Mass of body,m = 20/9.81 Kg
So,
Density of body = m/ Vb
= 20/9.81 ÷ 16/9810
= 2040.8 kg per cubic meter
Specific gravity of body = density of body ÷ density of water
= 2040.8 ÷ 1000
Specific gravity=2.04
Answer:
Weight difference =
20-16 = 4 N = Buoyant force of water
Buoyant Force in water(Fb) = density of water x g x volume of body(Vb)
4= 1000 x 9.81 x Vb
Vb = 4/9810 cubic meter
Now, in air
Weight of body = mg = 20 N
Mass of body,m = 20/9.81 Kg
So,
Density of body = m/ Vb
= 20/9.81 ÷ 16/9810
= 2040.8 kg per cubic meter
Specific gravity of body = density of body ÷ density of water
= 2040.8 ÷ 1000
Specific gravity=2.04
Explanation: