Question 29
Density and UpthrustAn object of mass m and volume v is totally immersed in a liquid of density ρ. The tension of a string holding it is
- A.mg
- B.(m + ρv)g
- C.(m − ρv)g
- D.ρvg
- E.[m/(m − ρv)]g.
Show the answer and explanation
Answer: C ((m − ρv)g)
Explanation
The string holds the weight minus the upthrust: T = mg − ρvg = (m − ρv)g.