24. The gravitational force exerted on a solid object is 5.00 N. When the object is suspended from a spring scale and sub- merged in water, the scale reads 3.50 N (Fig. P14.24). Find the density of the object. Scale Figure P14.24 Problems 24 and 25.

To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. She finds that the specimen weighs twice as much in air as it does in water. The density of the solid part of the specimen is 2.02 × 103 kg/m3. What fraction of the specimen’s apparent volume is solid?

An otter is swimming in the deep area of his tank at the zoo. The surface area of the otter's back is A = 0.45 m², and you may assume that his back is essentially flat. The gauge pressure of the water at the depth of the otter is P = 10500 Pa. Po- F= α 8 g k Po Enter an expression for the magnitude of the force F on the back of the otter in terms of the gauge pressure P and the atmospheric pressure ß A h m S π d j P t Solve for the magnitude of the force F, in newtons. The direction of the force F is always (||7|8 | 9 1^^ 4 5 6 1 2 3 0 END NO BACKSPACE DEL CLEAR * y HOME X Ⓒtheexpertta.com to the surface the water is in contact with (in this case, the back of the otter).

a) Calculate the buoyant force (in N) on a 2.40 L helium balloon.  N (upward) (b) Given the mass of the rubber in the balloon is 1.90 g, what is the net vertical force (in N) on the balloon if it is let go? You can neglect the volume of the rubber.  N (upward)