Salt water greater density than fresh water. A boat floats in both fresh at and

Question

Salt water greater density than fresh water. A boat floats in both fresh at and in salt water. In which fluid does the boat sink more? Fresh water. Salt water. It sinks the same in both. It depends on the weight of the boat. It depends on the volume of the boat. Water pressurized to 3.5 times 10^5 Pa is initially flowing at 5.0 tn/s in a horizontal pipe. If the pipe contracts to 1/3 its former area, what is the pressure and velocity of the water after the contraction? 2.5 times 10^5 Pa, 15 m/s 3.0 times 10^5 Pa, 10 m/s 3.0 times 10^5 Pa, 15 m/s 4.5 times 105 Pa, 1.5 m/s 5.5 times 105 Pa, 1.5 m/s

Explanation / Answer

When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt.

Because objects float better on a dense surface, they float better on salt water than fresh water. The denser the salt water, the easier it is for objects to float on top of it.

hence the boat will sink more in case of fresh water.

Part B

using equation of continuity

A1* v1 = A2 * v2

A2 = (A1) / 3

we get v2 = 15 m/s

using bernoulli theorem

P1 + 0.5*p*v1^2 = P2 + 0.5*p*v2^2

3.5 x 10^5 Pa + 0.5* 1000 kg/m3 * 5^2 = P2 + 0.5 * 1000 kg/m3 * 15^2

we get ......P2 = 2.5 x 10^5 Pa

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