The distance of the moon from the centre of the earth is 385,000 kilometres and moon’s diameter subtends an angle of 31’ at the eye of the observer. Find the diameter of the moon.

Assuming that the earth’s radius is 6400 km and that it subtends an angle of 57’ at the centre of the moon, find the distance of the centre of the moon from the earth’s centre.

Kunal is curious to find out the relationship between the diameter o the moon and the earth. From the available data, it is know that the volume of earth is 64 times the volume of the moon. He concluded that the diameter of the moon is 1/4 of the diameter of the earth. Show did he arrive at the conclusions?

Both earth andmoon are subject to the gravittional force of the sun. As observed from the sun, the orbit of the moon

The diameter of the moon is approximately one fourth the diamter of the earth. Find the ratio of their surface area.

A telescope has objective lens of focal length 15m. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 xx 10^6m , and the radius of lunar orbit is 3.8 xx 10^8m .

A 1.2 m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60^@ . After some time, the angle of elevation reduces to 30^@ (see fig.). Find the distance travelled by the balloon during the interval.

The diameter of the moon is approximately one-fourth the diameter of the earth. What fraction is the volume of the moon of the volume of the earth ?