Consider the following. Note: Draw the free body diagram in each case.
![1416_fbd.png](https://secure.tutorsglobe.com/CMSImages/1416_fbd.png)
(a) Figure (a) shows a sphere of radius r = 21 cm and density of ρ = 3.1 g/cm3 suspended in water. What is tension in the string? (Assume the density of the water is 1000 kg/m3.)
(b) Figure (b) shows a wooden sphere with a diameter of d = 18 cm density ρ = 0.7 g/cm3 held under water by a string. What is the tension in the string? (Assume the density of the water is 1000 kg/m3.)