One section of a pipe has a cross-sectional area of 20 cm^2, in this section wat
ID: 1612459 • Letter: O
Question
One section of a pipe has a cross-sectional area of 20 cm^2, in this section water has flow velocity of 1.0 m/s. Another section of this pipe has a constricted cross-sectional area of 5 cm^2. If the flow is steady, what is the water velocity in the constricted section? 0.25 m/s 0.50 m/s 1.0 m/s 2.0 m/s 4.0 m/s An iceberg is floating in the ocean with 10% of its volume extending above the ocean's surface. What can you say about the iceberg? Its weight is greater than the water it displaces. Its density is 90% that of the ocean water. It displaces only 90% of its weight in water. It must be resting on the bottom, since ice can't float in salt water. The density of ice is about 900 kg/m^3, and the density of water is about 1000 kg/m^3. A cubic block of ice one meter on a side floats in water. Assuming that the lowest square face of the cube is horizontal, the height of the block above the water line is: 0.1 m 0.2 m 0.5 m 0.8 m How does the velocity of air moving over the top of the wing of an airplane in flight compare to the velocity of air moving under the wing? (See Book, Bernoulli's principle) Explain your answer. The velocities are the same. The velocity over the wing is greater. The velocity under the wing is greater.Explanation / Answer
11. We know from Continuity equation A1*V1 = A2*V2
A1 =20 cm2
A2 =5 cm2
V1 =1.0 m/s
V2 = 20*1/5 = 4.0 m/s......Ans.
12. Take an iceberg of volume V. It has density d_i. So its total mass is V*d_i = m.
Now, it is displacing 90% of its volume. The sea water has a d_w. The total mass of water displaced is 0.9 * V * d_w, and it equals the mass of the iceberg, V*d_i.
(c) it displaces only 90% of its weight in water.
13. (A0 0.1 metre
10%
14. (B The velocity over the wing is greater.
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