and D are four trees
A,B,C, and D are four trees, located at the vertices of a square (Fig. 5.117). Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is n. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and (a) reaches C, (b) reaches D ?
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Aug
A,B,C, and D are four trees, located at the vertices of a square (Fig. 5.117). Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is n. At what angle should the bird fly from the direction of [...]
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A helicopter flies horizontally with constant velocity in a direction θ east of north between two points A and B ,
A) ,
and D are four trees ,
at distance d apart. Wind is blowing from south with constant speed u; the speed of helicopter relative to air is nu ,
B ,
C ,
where n > 1. Find the speed of the helicopter along AB. The helicopter returns from B to A with same speed nu relative to air in same wind. Find the total time for the journeys. ,