81. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
82. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be
83. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
84. The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)
85. The line of action of the buoyant force acts through the centroid of the
86. Two pipe systems are said to be equivalent when
87. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
88. A fluid is said to be ideal, if it is
89. The horizontal component of force on a curved surface is equal to the
90. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)
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