In winter,dew drops are seen on the grass in the morning .What is cause of these dew drops ?Are they visible in summer season too ?

You may have seen in a circus a motorcyclist driving in vertical loops inside a 'death- well' ( a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the minimum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m?

A fighter plane is flying horizontally at an altitude of 1.5 km with speed 720 km//h.At what angle of sightb (w.r.t.horizontal),when the target is seen,should the pilot drop the bomb in order to attack the target?