By X. Rasarus. Oklahoma City University. 2018.
Chapter 3 T ranslational otion In general prazosin 1mg on-line cholesterol free cheese, the motion of a body can be described in terms of translational and rotational motion cheap 1 mg prazosin otc definition of cholesterol ester. In pure translational motion all parts of the body have the same velocity and acceleration (Fig. In pure rotational motion, such as the rotation of a bar around a pivot, the rate of change in the angle θ is the same for all parts of the body (Fig. Many motions and movements encountered in nature are combinations of rotation and translation, as in the case of a body that rotates while falling. Theequationsoftranslationalmotionforconstantaccelerationarepresented in Appendix A and may be summarized as follows: In uniform acceleration, the ﬁnal velocity (v) of an object that has been accelerated for a time t is v v0 + at (3. Although in 32 Chapter 3 Translational Motion the process of jumping the acceleration of the body is usually not constant, the assumption of constant acceleration is necessary to solve the problems without undue diﬃculties. In the crouched position, at the start of the jump, the center of gravity is lowered by a dis- tance c. During the act of jumping, the legs generate a force by pressing down on the surface. Although this force varies through the jump, we will assume that it has a constant average value F. Because the feet of the jumper exert a force on the surface, an equal upward-directed force is exerted by the surface on the jumper (Newton’s third law). Thus, there are two forces acting on the jumper: her weight (W ), which is in the downward direction, and the reaction force (F ), which is in the upward direction. This force acts on the jumper until her body is erect and her feet leave the ground. The acceleration of the jumper in this stage of the jump (see Appendix A) is F − W F − W a (3. However, the mass of the Earth is so large that its acceleration due to the jump is negligible. After the body leaves the ground, the only force acting on it is the force of gravity W, which produces a downward acceleration −g on the body. At the maximum height H, just before the body starts falling back to the ground, the velocity is zero. The initial velocity for this part of the jump is the take-oﬀ velocity v given by Eq. Experi- ments have shown that in a good jump a well-built person generates an average reaction force that is twice his/her weight (i. The distance c, which is the lowering of the center of gravity in the crouch, is proportional to the length of the legs. For an average person, this distance is about 60 cm, which is our estimate for the height of a vertical jump. The height of a vertical jump can also be computed very simply from energy considerations. The work done on the body of the jumper by the force F during the jump is the product of the force F and the distance c over which this force acts (see Appendix A). At the full height of the jump H (before the jumper starts falling back to ground), the velocity of the jumper is zero. At this point, the kinetic energy is fully converted to potential energy as the center of mass of the jumper is raised to a height (c + H). The gravitational constant of the moon, for example, is one-sixth that of the Earth; therefore, the weight of a given object on the moon is one- sixth its weight on the Earth. It is a common mistake to assume that the height to which a person can jump on the moon increases in direct proportion to the decrease in weight. That is, if a person can jump to a height of 60 cm on Earth, that same person can jump up 6. Note that the ratio H /H 11 is true only for a particular choice of F in the calculation (see Exercise 3-2). The additional height is attained by using part of the kinetic energy of the run to raise the center of gravity oﬀ the ground. Let us calculate the height attainable in a running jump if the 1 2 jumper could use all his/her initial kinetic energy ( mv ) to raise his/her body 2 oﬀ the ground. If this energy were completely converted to potential energy by raising the center of gravity to a height H, then 1 2 MgH mv (3. Then we must remember that the center of gravity of a person is already about 1 m above the ground.
I advise with full assurance of satisfactory results generic prazosin 1mg overnight delivery cholesterol test biochemistry, that this remedy be used freely in the treatment of reflex irritations buy discount prazosin 1 mg online cholesterol check up bangalore. From one-half a grain to a grain and a half in an extreme case, will, I think, be sufficient. I would suggest that it be carefully used in the reflex irritations of pregnancy, especially when there is scanty urine, or when there is deficiency of renal action, with much local irritation. I am confident that it will do much towards preventing puerperal convulsions if given early. I think there are some cases of the vomiting of pregnancy that will be quickly allayed by it. I advise that it be given in hysterical conditions, and in those difficulties where there is irritation of the ovaries and irritation at the menstrual epoch, especially if accompanied with some pain. Lydston advised the use of this remedy in large doses in the treatment of epilepsy. Its antispasmodic properties would suggest that it be used in cases where the spasms are due to reflex irritation; whether it possesses sufficient antispasmodic properties to control spasm, as gelsemium, chloral and other agents of that character do, remains to be proven. Santonine at times is a positive remedy with which to increase the secretion of urine in children. It gently stimulates the functional action of the organs, promotes normal secretion and relieves irritation. It is without doubt, our best remedy with which to restore the secretion in post Ellingwood’s American Materia Medica, Therapeutics and Pharmacognosy - Page 54 scarlatinal or post diphtheritic nephritis. In conjunction with a persistent application of heat, it will be found useful in post puerperal nephritis, of an acute character, and probably in other cases, where sudden suppression has resulted from profound sepsis. Where we find colic with loose, slimy stools, it points to intestinal disorders, while convulsive movements are reflex symptoms, consequent upon the intestinal disease. Santonine influences these conditions by stimulating the great sympathetic and giving tone to the functions of digestion and nutrition. It has been employed with advantage in nervous failure of sight, nervous vomiting and nervous diarrhea; but it is doubtful whether it has ever improved the sight in amaurosis or cataract, as has been claimed. Santonine causes yellow vision and yellow urine, Where worms are demonstrated to exist in the bowels, it is a common practice to give santonine with a cathartic of podophyllin, or follow it with castor oil. The agent is toxic, as stated, and should not be given in material doses for the special purpose of destroying worms, when the child is constipated or suffering from fever. He gives it alone when he needs to restore the menses, and says he needs nothing with it. For young girls with their early menstruation and in cases of painful menstruation, he uses an infusion of the fresh root and expects to get satisfactory results. He takes one ounce of the root and lets it steep slowly for one hour in a pint of water and sweetens it. He takes from five to ten drops of the fluid extract to a cupful of hot sweetened water and gives this every half hour or every one or two hours as the patient needs. Ellingwood’s American Materia Medica, Therapeutics and Pharmacognosy - Page 55 The stimulant properties of this agent are of a local character, acting directly upon the mucous lining of the intestinal tract, and overcoming flatulence. It is also a stimulant to the secretory function of the skin, acting as a mild but efficient diaphoretic. In inflammatory conditions it should be avoided, but after the inflammation has abated, it will mildly stimulate the function of digestion and food appropriation. Other of our writers believe that it has a more important place than that given by most of our authors. Therapy—In acute nasal catarrh, where the discharge has not appeared, or has been suppressed, with the usual symptoms of headache and general oppression, muscular aching and general discomfort, it is given with good results. Inflammation of the conjunctiva, from taking cold, where there is profuse and constant lachrymation, will be relieved by it. In painful or longstanding spasmodic affections of the pulmonary region, as in whooping cough or bronchitis, it will be advantageous and, at the same time, it influences the digestive apparatus, correcting nausea, cholera and diarrhea, which may be present.
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