When small magnet is allowed to fall from aluminium pipe, then it will fall with acceleration less then 'g'. Why?

Three different objects of masses m_(1) , m_(2) and m_(2) are allowed to fall from rest and from the same point O along three different frictionless paths. The speeds of three objects on reaching the ground will be:

A conducting bar of 2m length is allowed to fall freely from a 50m high tower, keeping it aligned along the east-west direction. Find the emf induced in the rod when it is 20 m below the top of the tower. g = 10 "ms"^(-2) . Horizontal component of earth's magnetic field is 0.7 xx 10^(-4) T and angle of dip = 60^@ .

An apple falls from a tree. An insect in the apple finds that the earth is falling towards it with an acceleration 'g'. Who exerts the force needed to accelerate the earth with this acceleration? (AS_(7))

As shown in fig. a metal ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is ……

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

A body is thrown vertically upwards from A . The top of a tower . It reaches the ground in time t_(1) . It it is thrown vertically downwards from A with the same speed it reaches the ground in time t_(2) , If it is allowed to fall freely from A . then the time it takes to reach the ground. .

A light pointer fixed to one prong of a tuning fork touches gnetly a smoked vertical plate. The fork is set vibrating and the plate is allowed to fall freely. 8 complete oscilllations are counted when the plate falls through 10cm.What is the frequency of the tuning fork?