When the altitude of the sun is 30^@ the length of the shadow of a minaret on the ground is 30m .When the altitude of the sun is 60^@ ,find the length of the shadow of the minaret.

The height of mobile telephone tower erected on a plane is 20(sqrt3+1) m. When the altitudes of the sun is 30^@ and 45^@ ,the lengths of the shadows of the tower on the plane are x m and y m respectively, Show that x-y=40m.

The ratio of the length of a pole and its shadow is 1:sqrt3 .The angle of elevation of the sun is a) 30^@ b) 45^@ c) 60^@ d) 90^@

What will be the altitude of the sun when the length of the shadow of a vertical post is equal to the height of the post?

P and Q are respectively the base and the vertex of the tower PQ.AB is another tower which is at a certain distance apart from PQ.The height of AB is less than that of PQ and the base of AB is A.The angles of elevation of Q from A and B are respectively 60^@ and 45^@ .If AB=40m,find PQ,QA and QB.

A balloon is rising with a speed of 5ms^-1 . When it is at a height of 98m a packet is dropped from it. What is the velocity of the packet when it strikes the ground?

The height of a telephone tower erected on a plane is 20(sqrt3+1) m.When the altitudes of the sun is 30^@ and 45^@ ,the lengths of the shadwos of the tower on the plane are x m and y m respectively.Show that x-y=40m.

Area of a trapezium is 1350 m^2 and sum of the lengths of its parallel sides is three times the height. Find the height.

The focal lengths of objective and eyepiece of a telescope are 200 cm and 10 cm, respectively. It is used to get an image of the sun on a screen placed 40 cm behind the eyepiece. The diameter of the image is 6 cm. What is the diameter of the sun? Take, the distance from earth to the sun is 15 xx 10^(11) m.

The transmitting antenna at the top of a tower has a height of 32m. The height of the receiving antenna is 50m. What is the maximum distance between them for satisfactory LOS mode Communication? Radius of earth is 6.4xx10^3km .