pitcher’s arm through. The trunk includes the hips…Trunk rotation speed is all about the forward momentum of the body going from the back leg to the front leg and then finally the bracing action of the front leg and hip. Only pitching mechanics where forces are developed and transferred to the arm very late can produce more velocity with less risk of arm injury. The body‚ not the arm‚ produces velocity. This is why 45% of Little League pitchers and 60% of high school pitchers pitch with pain. They
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child’s angular momentum? a. 50 kg·m2/s b. 75 kg·m2/s* c. 150 kg·m2/s d. 300 kg·m2/s 3. Newton’s first law for rotational motion states that an object will maintain its state of rotational motion unless acted on by an unbalanced (or net): a. force b. velocity c. inertia d. torque* 4. A child with a mass of 20 kg sits at a distance of 2.0 m from the pivot point of a seesaw. Where should a 16-kg child sit to balance the seesaw? a. 1.6 m b. 2.0 m c. 2.5 m* d. 3.2 m 5. A solid sphere
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science. Likewise‚ man-made aircraft rely on these principles to overcome the force of gravity and achieve flight. Lighter-than-air craft‚ such as the hot air balloon‚ work on a buoyancy principle. They float on air much like rafts float on water. The density of a raft is less than that of water‚ so it floats. Although the density of water is constant‚ the density of air decreases with altitude. The density
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scenario‚ the company is having a problem aligning the employees with the new company vision. But as this example demonstrates‚ the employees do not understand why the vision is important and necessary therefore‚ they don ’t see it as fair and just to force them to promote. Thus‚ an example of the equity theory. "Defined generally‚ equity theory is a model of motivation that explains how people strive for fairness and justice in social exchanges or give and take relationships (Kinicki & Kreitner‚ 2003
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the first class‚ the second class‚ and the third class lever. Class one levers have a fulcrum located in between the effort and the load. The fulcrum is a fixed point around a lever which makes a lever turn. With a class one lever‚ the direction of force is changed. Some examples of class one levers include tin snips‚ scissors‚ and crowbars. Class one levers make work easier by moving the load a larger distance using less effort. For example it states‚ “As the load moves closer to the fulcrum‚ the
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IMPACT OF a jet ABSTRACT The objective of this experiment is to determine the force exerted by a jet of water on vanes of various shape.Three different shape of vanes;flat plate‚conical cup‚and hemispherical cup are used for this experiment.The results obtain from the experiment are then used to compare with the theoretical results.Force generated on the surface of vane depends on the rate of change of momentum and it can be calculated by recording the time taken for water to reach a certain
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importance of will or determination. It means that a man of determination can do what he likes. By the power of will he can have his way in everything. Ifs and buts are the mutterings of weakness‚ for all difficulties vanish when confronted with will-force‚ as do thieves when boldly faced. Even a cursory study of the history of human civilization tells us that all great things have always been achieved by men of will. Great men become great because from childhood onward they had willed to be great
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Hypothesis: If a car is involved in a crash‚ a domino effect of reactions will occur. Background: The modern day automobile is a very complex piece of machinery that has a lot to do with the world of physics. Like every great invention‚ there was a beginning. For the automobile this beginning was in 1769. Nicolas Cugnot‚ a Frenchmen inventing for the French Army‚ came up with was first self-propelled‚ steam engined‚ three wheeled cart that was said to go as fast as walking speed. The next
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the collision in terms of changing momentum‚ impulse‚ impact force‚ and impact time. All moving objects have a quantity of motion‚ otherwise known as momentum. Momentum of a moving object can be found by multiplying the mass of the object by the velocity. Because mass is measured in kilograms and velocity is measured in meters per second‚ the unit for momentum is kilogram meters per second. Similar to velocity‚ acceleration‚ and force‚ momentum is also described by its direction along with its quantity
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of the car? What horizontal force did he exert on the car? negligible‚ WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 3 OF 8 4. A 40.0-kg box initially at rest is pushed 5.00 m along a rough‚ horizontal floor with a constant applied force of 130 the work done by the applied force‚ N. If the coefficient of friction between the box and the floor is 0.300‚ find the energy loss due to friction‚ the work done by the normal force‚ the work done by gravity‚
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