Q1: (a) A water tank is completely filled with liquid water at 60°C. The tank material is such that it can withstand tension caused by a volume expansion of 4%. Determine the maximum temperature rise allowed without jeopardizing safety. Take water coefficient of expansion (B) as 5.22 x 104 1/K at this temperature. (b) A weight, as shown in figure QIb-(a) has to move at constant velocity of 2 m/s on an inclined surface with a coefficient of friction of 0.27. The width of the block is 20 cm. V = 2 m/s 50 cm F1 = ? 45° 200 N Fig Qlb-(a) i. Determine the force (F1) that needs to be applied in the horizontal direction. ii. By applying a thick oil film as shown in figure Qlb-(b), the force required to push the block reduced by 45%. If dynamic viscosity of the oil is 12 cP, determine the oil layer thickness. V = 2 m/s, h = ? F2 = 0.45F1 45° 200 N Fig Qlb-(b) 30 cm
Q1: (a) A water tank is completely filled with liquid water at 60°C. The tank material is such that it can withstand tension caused by a volume expansion of 4%. Determine the maximum temperature rise allowed without jeopardizing safety. Take water coefficient of expansion (B) as 5.22 x 104 1/K at this temperature. (b) A weight, as shown in figure QIb-(a) has to move at constant velocity of 2 m/s on an inclined surface with a coefficient of friction of 0.27. The width of the block is 20 cm. V = 2 m/s 50 cm F1 = ? 45° 200 N Fig Qlb-(a) i. Determine the force (F1) that needs to be applied in the horizontal direction. ii. By applying a thick oil film as shown in figure Qlb-(b), the force required to push the block reduced by 45%. If dynamic viscosity of the oil is 12 cP, determine the oil layer thickness. V = 2 m/s, h = ? F2 = 0.45F1 45° 200 N Fig Qlb-(b) 30 cm
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