An atomizer forms water droplets 45μm in diameter. Determine the excess pressure within these droplets using σ=0.0712N/m
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An atomizer forms water droplets 45μm in diameter. Determine the excess pressure within these droplets using σ=0.0712N/m
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- A square high-density polyethylene [a = 158 × 10-6/°C] plate has a width of 295 mm. A 177 mm diameter circular hole is located at the center of the plate. If the temperature of the plate increases by 45°C, determine: (a) the change in width of the plate. (b) the change in diameter of the hole. Answer: (a) Aw= (b) Ad = i i mm mmConsider water molecules in a water film that surrounds a silt particle. All the water molecules in the film have the same matric water potential. True FalseA 15 cm length of steel rod with relative density of 7.4 is submerged in a two layer fluid. The bottom layer is mercury and the top layer is water. The height of a top surface of the rod above the liquid interface in 'cm' is A. 8.24 B. 7.82 C. 7.64 D. 7.38
- 4.10 A solid cylinder of length H, diameter D and of relative density S floats in neutral equilibrium in water with its axis vertical. What is the ratio of H to D if S = 0.6? (a) 0.86 (c) 0.52 %3D (b) 0.72 (d) 0.46An aluminum cylinder (s.g=2.7) 15 cm high and with diameter d=8.1 cm slides down inside a tube with inner diameter D=8.2 cm, as shown in the figure. The cylinder is concentric with the axis of a tube and between them there is a thin film of oil of s.g. =0.8 with a kinematic viscosity of 0.075St. a) What is the (constant) rate of fall of the cylinder inside the tube? b) determine the torque needed to keep the inner cylinder rotating at an angular speed w=200rpm DAn atomizer forms water droplets 45μm in diameter. Determine the excess pressure within these droplets using σ = 0.0712 N/m.
- 1) A phosphor-bronze spring has the following dimensions: Length of strip = 400 mm Thickness of strip = 0.075 mm Width of strip = 0.5 mm The Young's modulus of phosphor-bronze is 12× 109 kg/m2. Estimate the torque exerted by the spring when it is turned through 90°. %3D [Ans. 0.83 x 10–6 kgm]OO O Water has a surface tension of 0.4 N/m. In a 3mm diameter vertical tube if the liquid rises 6 mm above the liquid outside the tube, calcutate the contact angle. Select one: 8.37 degree 90 degree 83.7 degree 0.83 degreeGlycerin flows at 35 m through a 150 mm diameter new wrought iron pipe at a velocity of 3 m/s. It has an absoluteviscosity of 1.50 Pa-s and a specific gravity of glycerin = 1.26.3. Solve for the coefficient of pipe friction
- In a two-layer fluid with specific gravities 1.2 and 0.9, a cube of 60 cm is immersed. If the upper and lower halves of the cube are composed of materials having specific gravity 0.6 and 1.4, respectively, then the height of cube above the interface of fluid is cm. [Assume, weight density of water as 9.81 kN/m³] (round off to the nearest integer). Liquid 1: S.G=0.9 S.G=0.6 S.G 1.4 60 cm Liquid 2: S.G=12 30 cm 30 cmThe temperature of a bar is reduced by 50°C. If the recorded elongation is -0.5 mm and the coefficient of thermal expansion is 11.7x10-/°C, the initial length of the bar is nearest to A 855 mm B 800 mm C 750 mm D 700 mmA 15 cm length of steel rod with relative density of 7.4 is submerged in a two layer fluid. The bottom layer is mercury and the top layer is water. The height of top surface of the rod above the liquid interface in 'cm' is