Question

On a day with no wind,a fountain in switzerland propels 30000 kg of water per minute to a height of 140 metres

Answer 1

Answer:

Step-by-step explanation:

laser is exactly at sea level by which I presume you mean the surface of the earth; at this altitude you could not hit any target also at sea level. In the figure I have drawn the earth, radius R, a point a distance h above the earth's surface (laser location), and another point a distance h above the earth's surface (target location). The distance between them is 2d. Focus your attention on one of the triangles with hypotenuse (R+h). From the Pythagorean theorem, d=√[(R+h)2-R2]=√[2Rh+h2]; if h<<R, d≈√(2Rh). For example, if h=10 km, about the