TYS-2053 Fluids & Heat Name 14. water enters a pipe of diameter 30 cm with a vel

Question

TYS-2053 Fluids & Heat Name 14. water enters a pipe of diameter 30 cm with a velocity of 4 m/s. The water encounters a constriction where its velocity is 64 m/s What is the diameter of the constricted portion of the pipe? (a) 3.3 cm (b) 7.5 em (c) 10 em (d) 15 em (e) 12 em 15. A 100 gm sample of steam starts at 100°C, & then loses 3,310 calories of heat. What is the heat loss in joules? (a) 13,856 joules (b) 13.856 joules (c) 5,800 joules (d) 242,788,000 joules (e) 242,788 joules Hartley Fall 17

Explanation / Answer

14. given intiail diameter, di = 30 cm

vi = 4 m/s

at the constriction

do = ?

vo = 64 m/s

from equation of continuity

vi*pi*di^2/4 = vo*pi*do^2/4

4*30^2 = 64*do^2

do = 7.5 cm

hence option b) is the correct answer

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