A bird is sitting on a tree. A girl observes the bird at an angle of elevation of 30. When she moves 50 m towards the tree, she observes the bird at an angle of elevation 60. How far is she now from tree

A boy standing in the middle of a field, observes a flying bird in the north at an angle of elevation of 30^(@) and after 2 minutes, he observes the same bird in the south at an angle of elevation of 60^(@) . If the bird flies all along in a straight line at a height of 50sqrt(3) m, then its speed in km/h is

A man standing on the bank of a river observes that the angle of elevation of the top of a tree just on the opposite bank is 60^(@) . The angle of elevation is 30^(@) from a point at a distance y m from the bank of the river. What is the height of the tree ?

A man standing on the bank of a river observes that the angle of elevation of the top of a tree just on the opposite bank is 60^(@). The angle of elevation is 30^(@) from a point at a distance y m from the bank. What is the height of the tree?

On the level ground, the angle of elevation of a tower is 30^(@) . On moving 20 m nearer, the angle of elevation is 60^(@) . The height of the tower is

The angle of elevation of the sun. When the length of the shadow of a tree is equal to the height of the tree is

Two persons simutaneously aim and fire their guns at a bird sitting on a tree. The first person fires his shot with a speed of 100m//s at an angle of projection of 30^(@) . The second person is ahead of the first by a distance of 50m and fire his shot with a speed of 80m//s . how must he aim his gun so that both the shots hit the bird simultaneously. Calculate the distance of the foot of the frre from two persons and the height of the tree. With what velocities and when do the two shorts hit the bird.

A person observed the angle of elevation of the top of a tower as 30o. He walked 50m towards the foot of the tower along level ground and found the angle of elevation of the top of the tower as 60o. Find the height of the tower.

Eshan purchased a new building for her business. Being in the prime location, she decided to make some more money by putting up an advertisement sign for a rental ad income on the roof of the building. From a point P on the ground level, the angle of elevation of the roof of the building is 30^@ and the angle of elevation of the top of the sign board is 45^@ . The point P is at a distance of 24 m from the base of the building. If the point of observation P is moved 10 m towards the base of the building, then the angle of elevation theta of the roof of the building is given by

A person standing on the bank of a river observes that the angle of elevation of the top of a tree standing on the opposite bank is 60^(@) . When he moves 40 m away from the bank, he finds the angle of elevation to be 30^(@) . Find the height of the tree and the width of the river. (sqrt3=1.73)