An ore sample weighs 15.00 N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 9.00 N. Find the total volume and the density of the sample.

Answer 1

hints:

1. conversion from weight to mass:
mass (in kg)
= weight (in N) / g (in m/s²)
= weight (in N) / 9.81

2. Archimedes principle
The upthrust on an immersed object equals the weight of liquid displaced (i.e. weight of liquid of net volume equal to object)

3. Density of water is 1 kg/L