an introduction to alfren waves by Cross

By Cross

Show description

Read or Download an introduction to alfren waves PDF

Best physics books

New Developments in Semiconductor Physics

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.

Additional info for an introduction to alfren waves

Sample text

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 .

Download PDF sample

Rated 4.16 of 5 – based on 14 votes