having dimples on the golf ball reduce drag? Firstly we have to look at the aerodynamics around golf balls‚ since the only force that can slow down a golf ball while in mid-air is the air flowing around the surface of it. We call these resistive forces drag forces‚ and there are two kinds which inevitably slow down spherical golf balls; pressure drag and skin friction drag. Skin friction drag is the shear forces on the sphere from the air molecules. Pressure drag is a resistive force caused by turbulent
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Today we know that aerodynamics plays a major role in many sports‚ such as tennis‚ soccer‚ hunting‚ and motor sports‚ we will investigate the effects of aerodynamics on baseball. The three main forces that act on a baseball in flight are the weight‚ drag‚ and lift. In an effort to understand how a baseball changes direction we will discuss an additional force called the lift coefficient or Magnus Force. This force is developed by the rotation or spinning of the baseball. We will discuss several
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falling in a vacuum‚ this would be the only force acting on the object. But in the atmosphere‚ the motion of a falling object is opposed by the air resistance or drag. The drag equation tells us that drag is equal to a coefficient times one half the air density (R) times the velocity (V) squared times a reference area on which the drag coefficient is based. The motion of a falling object can be described by Newton ’s second law of motion‚ Force = mass x acceleration. Do a little algebra and
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The Airfoil & Theories of Lift Airfoil Definition: Have you noticed the curved shape of a bird ’s wing? An airplane ’s wing is curved also. A wing is designed for flight. It has a special shape called an airfoil. The airfoil shape provides a lifting force when air flows around it. Airfoil shapes can be found on wings‚ fans and propellers. Importance: An airplane’s airfoil plays a very important role in lifting the aircraft. The airfoil is designed to increase the velocity of the
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Hezeng Wang Social Problems Discussion 1 Oct 3rd 2013 Drug Abuse In nowadays‚ drugs become more and more familiar to people. In fact‚ drugs actually are good to human beings. They can be used to help and lessen pain. However‚ drugs abuse has become an important social problem. According to the textbook‚ there are so many drugs in the United States‚ such as marijuana‚ cocaine‚ nicotine‚ heroin‚ alcohol‚ and so forth. According to a survey‚ more than 12.8 million Americans‚ about six
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called air resistance (drag)‚ which slows them down. Objects fall faster until they reach their terminal speed‚ which is reached when the upward (air resistance) and downward (weight) forces are equal. Falling objects When an object is dropped it gets faster and faster as it falls. This happens because their weight (the force of gravity) pulls them down towards the centre of the Earth. As they fall through the air‚ they also experience an upward force called air resistance (drag). RAF parachutist
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3.32 to 5.40 m sÀ1 as the length of straw increased from 1 to 10 cm. The drag coefficients for grain and resistance tally obtained terminal velocities. Tef grains drag coefficient decreased from 0.83 to 0.65 with increase in moisture content from 6.5% to 30.1%. Node-free straws exhibited higher resistance coefficients and end-node straws the lowest. & 2007 IAgrE. Published by Elsevier Ltd. All rights reserved. coefficient (drag coefficient  frontal area) for straw were calculated from the experimen-
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Air Resistance Lab G Luhman‚ Mary …. Abstract: The acceleration of objects dropped from about 2 meters was found in order to derive the Reynolds Number. The effect of changing weight‚ shape‚ and radius of the objects (balloons) were tested independently such that it would be clear under what criteria either laminar or turbulent air flow is prevalent. • Introduction The difference between two models‚ laminar and turbulent‚ of air resistance may seem trivial the difference is can be seen
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The drag‚ FD‚ on a sphere located in a pipe through which a fluid is flowing is to be determined experimentally. Assume that the drag is a function of the sphere diameter‚ d; the pipe diameter‚ D; the fluid velocity‚ v; and the fluid density‚ ρ. (a) What dimensionless parameters would you use for this problem? (b) Some experiments using water indicate that for d = 0.005 m‚ D = 0.0125 m‚ and v = 0.6 m/s‚ the drag is 6.5×10-3 N. If possible‚ estimate the drag on a sphere located in a 0.6 m diameter
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Introduction The projects objective is to design a bridge spanning across the Murrumbidgee River located near Gundagai. Through the use of hydrological data and hydraulic analysis we will determine the required height of the bridge corresponding to a specific frequency of flood. To design a bridge capable of spanning the Murrumbidgee River and flood plain will require hydrological analysis which takes into account all upstream data that is required for the catchment area of the river that will
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