1.An object hangs from a spring balance. The balance indicates 30 N in air and 15 N when the ob ject is entirely submerged in water and 20 N when entirely submerged in an unknown liquid with density ρ. What is the ratio of the density of the unknown liquid to the density of water (i.e., ρ/ρwater )?
Answ:2/3
2.Suppose that you release a small ball from rest at a depth d below the surface in a pool of water and the ball rises and as the ball emerges from the water it shoots up a distance 3d above the water. If the drag force on the ball from the water is negligible, what is the ratio of the density of the ball to the density of water, ρball /ρwater ? (Neglect any transfer of energy to the splashing and waves produced by the emerging ball and assume that you are near the surface of the
Earth.)
Answ:0.25
Answ:2/3
2.Suppose that you release a small ball from rest at a depth d below the surface in a pool of water and the ball rises and as the ball emerges from the water it shoots up a distance 3d above the water. If the drag force on the ball from the water is negligible, what is the ratio of the density of the ball to the density of water, ρball /ρwater ? (Neglect any transfer of energy to the splashing and waves produced by the emerging ball and assume that you are near the surface of the
Earth.)
Answ:0.25