A gramophone record is rotating at 90 r.p.m. and a coin of mass 20 g is placed at a distance of 10 cm from its centre. What is the centrifugal force acting on the coin ?

A gramophone disc rotates at 60 revolutions per minute. A coin of mass 13 g is placed at the disc at a distance of 8.0 cm from the centre. Calculate centrifugal force on the coin.

A gramophone record is revolving with an angular speed .A coin is placed at a distance r from the centre of the record.RThe coefficient of static friction is u.the coin will revolve with the record if :

A stone of mass 100 g is rotating in a circular orbit of radius 50 cm with a frequency 5 r.p.s.find the centripetl force acting on the stone.

Draw a circle of radius 3cm. Take two point P and Q on one of its extended diameter each at distance of 7cm from its centre. Draw tangents to the circle from these two points P and Q

A double convex lens made of glass of refactive index 1.56 has both radii of curvature of magnitude 20 cm.If an object is placed at a distance of 10 cm from this lens,find the positiojn of the image formed.

A bar magnet of length 10cm is placed in the magnetic meridian with its north pole pointing towards the geographical north. A neutral point is obtained at a distance of 12cm from the centre of the magnet. Find the magnetic moment of the magnet, when H=0.34 gauss.

The radius of a circle is 13 cm and the length of one of its chord is 10 cm. Find the distance of the chord from the centre.