Quiz1a - Exam 2C, Fluid Mechanics Name_ MULTIPLE CHOICE....

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2C, Fluid Mechanics Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is a WRONG statement. A) When an ice cube floating in a glass of water melts, the level of water remains the same. B) The reason that buoyant force acts upward on a submerged object is that upward pressure against the bottom is greater than downward pressure against the top of the submerged object. C) Variation of hydrostatic pressure in a fluid with the height/depth is proportional to the density of the fluid. D) An ice cube with a cork frozen into it is floating in a glass of water. When the ice melts the water level remains the same. E) For a piece of wood floating in water, the volume of the submerged part is given by the expression m /ρ, where m is the mass of the piece and ρ is the density of wood. 2) Which of the following is a WRONG statement. A) A completely submerged object always displaces its own volume of fluid. B) Positioning of the center of buoyancy of a boat above its center of gravity guarantees stability of the boat. C) Hydrostatic equilibrium in the presence of a gravitational force implies that pressure in the fluid varies along the direction of the gravitational force. D) A steady flow implies that the velocity does not change in time, but might still change along streamlines. E) For a pump submerged at the bottom of a deep well, it takes less power to pump water to the surface when the well is half - empty than when the well is full. 3) Which of the following is a WRONG statement. A) The pressure at the bottom of a jug filled with water does NOT depend on surface area of water. B) Bernoulli's equation originates from the conservation of energy. C) A helium - filled balloon released in the atmosphere will rise until the pressure inside the balloon equals atmospheric pressure. D) Multiplication of force by hydraulic press is done at expense of the distance through which this force acts. E) The buoyant force acting on a one - ton blimp hovering in the air is one ton. 4) A piece of styrofoam with a steel nut on top of it is floating in a cylindrical vessel, which is filled with water (density 1000 kg/m 3) and has a cross - sectional area of 0.02 m 2 . The mass of the nut is 0.028 kg and the density of steel is 7900 kg/m 3 . By how much does the level of water in the vessel change after the nut drops to its bottom (while the piece of styrofoam remains floating)? A) 0 B) 1.2 mm C) 9.7 mm D) - 1.2 mm E) - 9.7 mm 5) A small submarine has a round window with a diameter of 50 cm, which can sustain a maximal total force of 50 kN. The air inside the submarine is pressurized at 1.5 atm (1 atm = 10 5 Pa). To what maximal depth (as measured at the level of the window) can the submarine dive? A) 10 m
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Quiz1a - Exam 2C, Fluid Mechanics Name_ MULTIPLE CHOICE....

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