61. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is
62. The center of pressure of a surface subjected to fluid pressure is the point
63. Surface tension
64. The normal stress in a fluid will be constant in all directions at a point only if
65. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is
66. A floating body is said to be in a state of stable equilibrium
67. A body floats in stable equilibrium
68. Metacentric height for small values of angle of heel is the distance between the
69. If no resistance is encountered by displacement, such a substance is known as
70. The volumetric change of the fluid caused by a resistance is known as
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