why are 67 and 68 true.? why metal feels cold E. The metal is colder because it

Question

why are 67 and 68 true.?

why metal feels cold E. The metal is colder because it has lower temperatu re and better heat conductivity with velocity v enters both tubes shown in the picture. After exiting the tubes: 67. Water 2 longer range will have water from tube 1 B. )longer range will have water from tube 2 C. Water from both tubes have the same range D. the range depends on the entrance velocity v E. nothing is correct 68. At which points is pressure the greatest? A. A and D B. B and E C. C E-They are all the same

Explanation / Answer

67-

Velocity at exit will be higher in tube 2 than tube 1.

Velocity is inversely proportional to area .

Exit area in tube 1 is greater than inlet . Hence velocity exit from tube 1 is less than the tube 2 (constant area have same velocity at exit and inlet) .

Hence range of water from tube 2 is longer. ( high exit velocity than tube 1).

Hence option (b) is correct.

68-

Point A,B,C,D and E are at same depth from surface layer. Hence water pressure will be equal at all points.

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