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This quantity includes lecture notes and chosen contributed papers awarded on the overseas summer season university on New advancements in Semiconductor Physics held on the collage of Szeged, July 1-6, 1979. the foremost a part of the contributions during this quantity is expounded to the hot experimental technics and theoretical rules utilized in examine of latest semiconductor fabrics, as a rule III-V semiconductors.
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N o w we come to t h e i m p o r t a n t question: H o w does a boomerang m o v e under the influence of these aerodynamic forces and torques (and of the force of g r a v i t y , of course)? As m e n t i o n e d earlier v 48 Felix Hess the average torque T causes the gyroscopic precession of a boomerang. Let us take a closer look at the gyroscope. I f a gyroscope spins around its axis w i t h a r o t a t i o n a l v e l o c i t y co a n d one exerts a torque T on i t , acting around an axis perpendicu l a r to the spin axis, the gyroscope precesses around an axis perpendicular to b o t h the spin axis and the torque axis (Fig.
A t t a c h a plasticine cake about 5 m m t h i c k t o the bottom of a glass (or jar) about 9 cm i n diameter and 18 cm h i g h . A t t a c h the m i c r o m o t o r to i t , a l l o w i n g a clearance between the lower end of its shaft and the plasticine cake. The wires from the m i c r o m o t o r should be fastened t o t h e inside w a l l of the glass w i t h adhesive or plasticine. Fig. 23 shows the setup ready for operation. F i l l the glass w i t h water. Then pour in a layer of sunflower oil 1-2 cm t h i c k .
29). This force is the same as the l i f t i n g force exerted 011 the wings of an a i r p l a n e . I n a right-handed throw the force w i l l be directed from the right to the left as viewed by the thrower. Lift (L) Velocity (r) Fig. 29 Fig. 30 This force alone, however, is not sufficient to m a k e a boomerang curve to the left. F o l l o w i n g one boomerang arm d u r i n g its mot i o n , one can see t h a t its velocity w i t h respect to the air is not constant. W h e n t h e arm p o i n t s u p w a r d , the forward velocity of the boomerang adds to the velocity due to the r o t a t i o n ; when it points d o w n w a r d , the t w o velocities are i n opposite directions, so t h a t the resultant speed w i l l be smaller or even vanish at some p o i n t s (see F i g .