a stone weighs 0.25N in air and o.20N when completely immersed in water. what is the the up thrust on the stone?
to study
Weight of water displaced = .25-.20 = .05 N which is the force up on the stone from the water.
I have always wondered what pure physics means, now I know: Archimedes Problem solving.
I thought at one time in my life, Pure Physics was what ever science politicians could not comprehend. But I changed my mind, as they cannot grasp hardly any science (or math).
To find the upthrust on the stone, we need to compare its weight in air to its apparent weight in water.
The weight of the stone in air is given as 0.25N. This is the force with which the stone is pulled downwards due to gravity.
When the stone is completely immersed in water, it experiences an upward force called buoyancy or upthrust. This force counteracts the weight of the stone and makes it feel lighter in water.
The apparent weight of the stone in water is given as 0.20N. This means that the stone's weight is reduced by 0.05N when submerged in water (0.25N - 0.20N).
Therefore, the upthrust on the stone is equal to the weight reduction, which is 0.05N.