An aeroplane is flying parallel to the Earth's surface at a speed of 175 m/sec and at a height of 600m. The anlge elevation of the aeroplane from a point on the Earth's surface is `37^(@)` at a given point. After what period of time does the angle of elevation increase to `53^(@)`? `(tan 53^(@)=1.3270, tan 37^(@)=0.7536)`.

A aeroplane is flying at a constanct horizontal velocity of 600 km/hr at an elevation of 6km towards a point directly above the target on the earth's surface. At a approprate time, the pilot releases a ball so that it strikes the taraget at the earth. The ball will appear to be falling :

A TV tower stands vertically on a bank of a canal. The tower is watched from a point on the other bank directly opposite to it. The angle of elevation of the top of the tower is 58^(@) . From another point 20m away from this point on the line joining this point to the foot of the tower , the angle of elevation of the top of the tower is 30^(@) . Find the height of the tower and the width of the canal . (tan 58^@ = 1.6003)

A statue 1.6 m tall stands on the top of a pedestal. From a point on the ground, the angle of elevation of the top of the statue is 60^(@) and from the same point angle of elevation of the top of the pedestal is 40^(@) . Find the height of the pedestal. (tan40^(@)=0.8931, sqrt(3)=1.732)

The angle of elevation of a jet plane from a point A on the ground is 60^(@) . After a flight of 15 seconds, the angle of elevation changes to 30^(@) . If the jet plane is flying at a constant height of 1500sqrt13 meter, find the speed of the jet plane. (sqrt3 = 1.732)

A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a certain point A on the path, he observes that the angle of elevation of the top of the pillar is 30^0 . After walking for 10 minutes from A in the same direction, at a point B, he observes that the angle of elevation of the top of the pillar is 60^0 . Then the time taken (in minutes) by him, from B to reach the pillar, is : (1) 6 (2) 10 (3) 20 (4) 5