As a plane moves away from a viewer what happens to the elevation of the plane as observed from the same observation point ? Increases or decreases ?

What happens to the tail of a comet when it moves far away from the sun ?

An observer is moving away from a source at rest. The pitch of the note heard by the observer is less because

The angle of elevation of the bottom of a window 10 m above the ground level from a point on the ground is 30^@ A pole projecting outwards from the bottom of the window makes an angle of 30^@ with the wall. If the angle of elevation of the top of the pole observed from the same point on the ground is 60^@, find the length of the pole to the nearest whole number.

An observer 1.5 m tall is 28.5 m away from a tower and the angle of elevation of the top of the tower from the eye of the observer is 45^(@) . The height of the tower is

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450 sqrt""3 metres from point P observes that angle of elevation of the balloon is 60^(@) Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?

An observer 1.5 metres tall is 20.5 m away from a tower 22 metres high. Determine the angle of elevation of the top of the tower from the eye of the observer.

An aeroplane flying at a height of 300 m above the ground passes vertically above another plane at an instant when the angles of elevation of two planes from the same point on the ground are 60^(@) and 45^(@), respectively. What is the height of the lower plane from the ground?

An aeroplane flying at a height 300 metre above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 60^(@) and 45^(@) respectively.Then the height of the lower plane from the ground in metres is