A ball bearing of mass 180 g is hung on a thread in oil of density 800 kg m−3. Calculate the tension in the string if the density of the ball bearing is 8000 kg m−3.
Answer
We can calculate tension as below process
Volume of ball bearing = mass/density
Volume of oil displaced
Mass of loil displaced
Buoyancy force
= weight of liquid displaced
= mg
= 0.177N (upwards)
Weight of ball bearing
= mg
= 1.77N (downwards)
so Tension = weight - buoyancy
= 1.77 - 0.177
= 1.6N
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