A small coin is placed on a record roting at `33 1/3` rev/minute. The coin does not slip on the record. Where does it get the required centripetal fore from?

From where does a satellite revolving around a planet get the required centrepetal force?

A small coin is placed at a distance r from the centre of a gramophone record.The rotational speed of the record is gradually increased. If the coefficient of friction between the coin and the record is mu, the minimum angular frequency of the record for which the coin will fly off is given by :

A coin is placed on a horizontal platform, which undergoes horizontal simple harmonic motion about a mean position O. The coin does not slip on the platform. The force of friction acting on the coin is F. (i) F is always directed towards O (ii) F is directed towards O when the coin is moving away from O, and away from O when the coin moves towards O (iii) F=0 when the coin and platform come to rest momentarily at the extreme position of the harmonic motion (iv) F is maximum when the coin and platform come to rest momentarily at the extreme position of the harmonic motion

As mosquito is sitting on an L.P. record disc rotating on a turn table at 33 1/3 revolutions per minute. The distance of the mosquito from the center of the turn table is 10 cm. Show that the friction coefficient between the record and the mosquito is greater than pi^2/81 . Take g=10m/s^2

A small coin is placed on a flat horizontal turn table. The turn table is observed to make three revolutions in 3.14 sec . What is the coefficient of static friction between the coin and turn table if the coin is observed to slide off the turn table when it is greater than 10cm from the centre of turn table .

A classroom demonstration of Newton's first law is as follows: A glass is covered with a plastic card and a coin is placed on the card. The card is given a quick strike and the coin falls in the glass. a.Should the friction coeficient between the card and the coin be small or large? b. Should the coin be light or heavy? c. Why does the experiment fail ifteh card is gently pushed?

An empty spherical flask of diameter 15 cm is placed in water of mu = 4//3 . A parallel beam of light strikes the flask. Where does it get focussed, when observed from within the flask ?