Chapter 13, Problem 67P

& (a) Determine the force that a vertical string exerts on a 0.80-kg rock of density ${\text{850**\#x00A0;kg/m}}^{\text{3}}$ when it is fully submerged in water of density ${\text{1000 kg/m}}^{\text{3}}$. (b) If the force exerted by the string supporting the rock increases by 12% when the rock is submerged in a different fluid, what is that fluid's density? (c) If the density of another rock of the same volume is 12% greater, what happens to the buoyant force the water exerts on it?