an ore sample weighs 15N (newton) in air. when the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 10.80 N. find the volume and the total density of the sample..
2006-11-19 01:34:33 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Use Archimedes's buoyancy principal. The weight outside represents the response of mass to the Earth's gravity. The weight in water represents the displaced water's weight. Use the ratio to get the answer. HINT: if you convert to mass, the answer almost gives itself away.
The displaced water has a well known density. That density will give the volume of the both the displaced water and the object displacing it.
2006-11-19 01:55:37 · answer #1 · answered by Jack 7 · 0⤊ 0⤋
w in air=15/g kg [g=1/9.8ms^2]
w in water=10.80/g kg
Upward force by water=15-10.80=4.20N
If the container is full water spilled=4.20/g kg (I'm not sure)
the volume of 1kg water is 1liter i.e. 1cm^3 (I'm not sure)
the volume of the sample=volume of the water spilled=4.20/g cm^3
density=weight/volume, both r known
Oh God Ive forgot everything in 2 yrs, can u believe this?
2006-11-19 09:52:03 · answer #2 · answered by Banglacat 2 · 0⤊ 0⤋
volume=volume of the waterdisplaced
density=weight in air/apparent loss of weight in water
=15/4.20=3.57 kg/m^3
volume of thesample=M/D=15/(9.8*3.57)
=0.43 m^3
2006-11-19 10:04:17 · answer #3 · answered by raj 7 · 0⤊ 0⤋