The relation between drag force and body speed is O Proportional with the squared value Proportional Inverse with the squared value Inverse
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- 1) Discuss the importance of lift and drag with the help of examples.3-A vehicle is moving at 90 km/h at an air temperature of 20 °C (the density of air at this temperature is 1.204 kg/m3). The front view area of the vehicle is 3.2 m2. If the drag force acting in the flow direction of the vehicle is 175 N, what is the drag coefficient?If forced convection uses Reynolds number to account for fluid movement during forced convection, what dimensionless number is used for natural convection? A. Nusselt number B. Einstein number C. Grashof number D. Prandtl number
- 1) Calculate the drag force (unit: N) of a sphere particle in 20°C water. Know the diameter of the particle = 1 cm; the Reynolds number of water = 1; dynamic viscosity of 20°C water = 0.001 kg/ms; velocity of the particle = 0.02 m/s. 2) When calculate the lift coefficient, the area A in the equation is: a) surface area b) planform area c) cross-sectional area d) frontal area 3) The sum of the components of the pressure and wall shear forces (a) in the flow direction is called ____ and (b) in the normal direction is called ____. a) Friction, Pressure b) Lift, Drag c) Pressure, Friction d) Drag, LiftA sphere (Cd = 0.2) 1 ft in diameter travels at 100 ft/sec in standard atmospheric air. What is the drag force? A. 0.0117 lbf C. 0.0712 lbf B. 0.0217 lbf D. 0.0127 lbfA solid sphere having diameter 5 mm is falling through oil of density 800 kg/m? and dynamic viscosity 0.8 kg/m-s at a constant velocity of 1 cm/s. Drag force on the sphere
- The iceberg idealization may becomeunstable if its sides melt and its height exceeds its width. InFig. suppose that the height is L and the depth intothe paper is L , but the width in the plane of the paper isH , L. Assuming S =0.88 for the iceberg, fi nd the ratio H / Lfor which it becomes neutrally stable (about to overturn).You are working in a machine tool manufacturing industry for the project to design CNCcontrol shaper machines. In the shaper machine, a rectangular plate of 8.75 m2area hasto move slowly at a constant speed of 20 mm/minute over a fixed plate. The distancebetween the moving and fixed table is 0.0254 mm, and the gap is filled by a fluid ofviscosity 8.17 × 10−5 N−sm2. Calculate the amount of force required to move the plate.A flat plate having area 3 x 106 mm2 moves at 1200 m/min in stationary air of density 1.12 kg/m3. If the co efficient of drag and lift are 0.12 and 0.89 respectively. Determine i] Lift force ii] Drag force iii] The resultant force iv] Direction of resultant v] Power exerted by air on the plate
- A correlation of computational fl uid dynamics results indicatesthat, all other things being equal, the distance traveledby a well-hit baseball varies inversely as the 0.36 power ofthe air density. If a home-run ball hit in Citi Field in NewYork travels 400 ft, estimate the distance it would travel in( a ) Quito, Ecuador, and ( b ) Colorado Springs, CO.Write the importance of dimensional analysis in convection heat transfer.A 150 million-kg cargo ship starts from rest. The total force exerted on it by itsengines and hydrodynamic drag (in Newton) can be approximated as a function oftime in second by ΣFt = 937,500 – 0.65t2. Use the principle of impulse andmomentum to determine how fast the ship is moving in 16 minutes.