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The number of static equations in this case exceeds the number of un- known contact forces discount 100mg prometrium with mastercard. The ballerina is unstable in the sense that a perturbation from her equilibrium position will require finite movement at her ankle and her arms to restore the resting configuration. His pose and facial expressions, however, are intended to con- vince us that he is able to defy gravity by hanging in air. Static equilibrium requires that the sum of the horizontal forces must be equal to zero, and so we have two unknown horizontal force components and one equation. The couple is in a statically sta- ble position because a small alteration in the posture will not lead to larger alterations; all it will do is to change the magnitudes of the reaction forces acting on each foot of the male dancer. If a horizontal force is exerted on this couple, frictional forces at the male dancer’s feet could balance the applied force and the couple would remain in static equilibrium. If we assume that the force exerted by the partner on the ballerina acts along the direction of the bal- lerina’s arm, then we have a statically determinate situation. The force exerted by her partner could be either tension or compression and thus would prevent her rotating clockwise or counterclockwise. This is just one of the several poses in classical ballet in which the ballerina strikes a delicate balance. In another posture, called an attitude, the body is supported on one leg with the other lifted to the front, side, or back with the knee flexed. In an arabesque, the body is supported on one leg while the other is fully extended behind the dancer. The contact forces acting on a ballerina in such poses are the ver- tical and horizontal ground forces. There are three equations of equilib- rium to be satisfied with two unknown forces. Unless the ballerina can keep her center of mass right on top of the ground force acting on it, the resultant external moment acting on her would not be equal to zero.

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Free ¯ythrough using the input devices that give the user the ability to examine the inner and the outer surface of the colonic wall discount prometrium 200mg on line. This is helpful when the user detects a tumor on the inner surface and wants to see if the tumor extends to the other surface. The mode gives the impression of relating to the user and keeps him or her inside the colon. It is helpful for quick examination of the colon and does not warn the user when he or she is stuck on the colonic wall. The three features allow the viewing position to be reset to an initial position and increase and decrease the scale. Much less patient discomfort results because there is no need to reposition the patient. The radiation dose used in virtual endoscopy is one half of one quarter of the average exposure in barium enema and an unlimited number of viewing angles can be exploited. There is also no need for sedation, and the patient can resume normal activities immediately after the CT scanning procedure. In addition, by adopting a virtual medical worlds interface, the pragmatics of de®ning and creating virtual envi- ronments are abstracted from the practitioner. A practitioner then has a choice, depending on the availability of supportive hardware, on how to visu- alize patient data. This chapter was not concentrated with the speci®cs of vir- tual reality techniques and did not provide detailed explanations of its use. It outlined a possible framework for how these advanced imaging techniques could be integrated into a general telemedical information society. Presently, the cost of VR hardware and software has restricted its usage to only a few medical institutions. However, it is envisaged that as these costs are reduced, the technology will become more widespread. Surgery planning programs such as VRASP are already available to allow a surgeon to practice an operation on a virtual model of the patient and then use this virtual operation to assist during the real operation.