Why does a block of plastic released under water come up to the surface of water?
NCERT Class IX
Sciences - Main Course Book
Chapter 10. Gravitation
Answers
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3
the upthrust experienced by the block when it is fully immersed in water is greater than the weight of the block in air so the block comes up to the surface to maintain equality between the upthrust & weight
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Answer:
Volume of part of wooden block immersed in water V
in
=(40×40×5) cm
2
=(40×40×5) ×10
−6
m
3
Density of water σ
w
=10
3
kg/m
3
Weight of wooden block = Weight of water displaced
Mg=V
in
σ
w
g
Mg=(40×40×5)×10
−6
×10
3
g
⇒M=8 kg
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