An Analysis of the Volleyball Jump Serve | Dr Marion Alexander‚ Adrian Honish MSc - Sport Biomechanics Lab‚ University of Manitoba‚ Canada | IntroductionOne of the most dramatic skills in modern volleyball is the spike serve‚ or the jump serve‚ which provides an exciting and dynamic skill that is captivating for players and spectators alike. The player starts about five meters behind the end line of the court‚ uses a fast and explosive run up‚ a dynamic spike takeoff and an exciting spike
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Any slight change or rotation can cause the object to change direction in general making it not move toward the specified direction. Eg: ball thrown by a man in a straight line. Circular motion Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform‚ with constant angular rate of rotation (and constant speed)‚ or non-uniform with a changing rate of rotation. The rotation around a fixed axis of
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object’s resistance to changes in its rotation. It must be very specific to the chosen axis of rotation. Also‚ it is specific to the mass and shape of the object‚ including the way that is mass is distributed in the object. Moment of inertia is usually quantified in kgm2. An object’s where the mass is concentrated very close to the center of axis of rotation will be easier to spin than an object of identical mass with the mass concentrated far from the axis of rotation. A common example is to think of
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efficiency‚ convenient operation and maintenance. 3.The vibrator uses large clearance bearings‚ labyrinth seal and thin oil lubrication. Working principles of vibrating screen: The motor drives the eccentric block of the exciter to do high-speed rotation through the coupling. The rotating eccentric block produces strong centrifugal force to stimulate sieve box to perform certain amplitude circular motion. Being affected by the impulse from the sieve box‚ the materials on the oblique screen surface
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constructed by reference to the rotation axis of the Earth. The primary reference points are the poles where the axis of rotation of the Earth intersects the reference surface. Planes which contain the rotation axis intersect the surface in the meridians and the angle between any one meridian plane and that through Greenwich (the Prime Meridian) defines the longitude: meridians are lines of constant longitude. The plane through the centre of the Earth and orthogonal to the rotation axis intersects the surface
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dust‚ soda ash‚ recycled rubber powder‚ zinc oxide‚ calcium carbonate and small pieces of coal. Screw conveyor is not suitable for conveying perishable and viscous materials and materials which is easy to blocking. Spiral blades welded on the rotation axis of screw conveyor have different types according to varied transported materials‚ like entity type‚ belt type‚ blade type and other types. At the end of materials direction of motion‚ on the rotating shaft of screw conveyor has locating bearing
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Operating Principle: Cyclone desander is based on the principles of centrifugal sedimentation and density difference‚ when the water under a certain pressure from desanding into the equipment by the inlet to tangential‚ it will come about a strong rotation‚ due to the different density of sand and water‚ under the common action of the centrifugal force‚ centripetal force‚ buoyancy and fluid drag force‚ make the low density water rising‚ and expel from the outlet‚ the dense sand will be discharge outlet
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Breathing Aspect Studying the different phases of breathing may seem silly because we do it everyday. In swimming however‚ it is important to learn how and when to inhale and exhale properly. This aspect comes with some common faults that negatively affect the swimmers’ performance. Developing a good breathing technique is perhaps the biggest challenge for beginner and intermediate swimmers. Many swimmers have a problem with their stroke that is related to their breathing technique without realizing
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has its centre on the axis. For e.g.‚ in an oscillating table fan or pedestal fan‚ the axis of rotation is horizontal. This axis has an oscillating sideways movement in a horizontal plane about the vertical through the point at which the axis is pivoted. (3) Combination Of Translational And Rotational Motion- for e.g.‚ when a cylinder rolls down an inclined plane‚ its motion is a combination of rotation about a fixed axis and translation. As the cylinder shifts from top to the bottom of inclined
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papers have been published on arXiv.com‚ the first describing the phenomenon (Shiryaeva et al)‚ the second offering a theoretical model for the observations (Amjadi et al). The papers differ in their explanations. Shiryaeva claims that rotation is caused by a surface effect but gives no clear mechanism as to how this could arise. Shiryaeva makes use of edge effects arising from Reynold’s Stresses and Taylor Aris dispersion. On the basis of our investigations we present a new theory
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