QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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 Solution :-

Given that,

The speed of the water surface is much less than the water speed at the outlet as shown in below figure.

Pressure P1 = 10KPa

Height H = 0.5m

We know that,

where

P1 = Pressure at top of the tank.

V1 = Velocity at top of the tank

P = specific weight of water

g = acceleration due to gravity

Z1 = height of the tank.

P2 = pressure at outlet of the tank

V2 = velocity at top of outlet of the tank

Z2 = height at outlet of the tank.

Since the surface velocity is much less the water speed at the outlet the surface velocity of water is zero.

Pressure at the outlet is zero because the outlet of the tank is open to the atmosphere.