He weight of a body in air is 100n. how much will it weigh in water, if it displaces 400 cc of water?
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Answered by
15
96.078N, which is 100N minus the weight of 400cc of water in newtons, which is 3.922N, assuming pure water at 20 degree Celsius and at the sea level.
It must be a very light body thou compared to its weight to be afloat on water with most of its mass above the water level. Do you want to calculate the specific weight of that body and find which material could it be made of? You might be surprised to find that it could be even be made of iron, as long as its shape allows it to have a large enough cavity that remains empty; a barrel for example which empty weight is about 10kg, 10,197 precisely.
It must be a very light body thou compared to its weight to be afloat on water with most of its mass above the water level. Do you want to calculate the specific weight of that body and find which material could it be made of? You might be surprised to find that it could be even be made of iron, as long as its shape allows it to have a large enough cavity that remains empty; a barrel for example which empty weight is about 10kg, 10,197 precisely.
Answered by
9
Given:
Weight of body in air = 100n
To find:
Weight if the displacement is 400cc
Solution:
Buoyant force = Weight of liquid displaced
Thus,
p = m/v
m = p x v
m = 1 × 400
= 400
Weight of water displaced = W = m × g
w = 2/5 x 9.8
= 3.92
Thus, weight of the object in water -
W = 100−3.92
= 96.08
= 96
Answer: The weight of object in water is 96 N
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