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?

A gramphone record is revolving with an angular velocity omega . A coin is placed at a distance r from the centre of the record. The static coefficient of friction is mu . The coin will revolve with the record if

A wedge as shown in figure has a rough curved surface of coefficient of kinetic friction (1)/sqrt(3) whose shape can be given by equation y=x^(2) , where the horizontal direction is x-axis, vertical direction as y axis and the end of surface O as origin and x & y are measured in meter. A small block is released, from a certain point on the surface. The maximum height of the point from where block should be released so that it does not slip.

Two identical small balls each of mass m are rigidly affixed at the ends of light rigid rod of length 1.5 m and the assmebly is placed symmetrically on an elevated protrusion of width l as shown in the figure. The rod-ball assmebly is titled by a small angle theta in the vertical plane as shown in the figure and released. Estimate time-period (in seconds) of the oscillation of the rod-ball assembly assuming collisions of the rod with corners of the protrusion to be perfectly elastic and the rod does not slide on the corners. Assume theta=gl (numerically in radians), where g is the acceleration of free fall.

A disc revolves with a speed of 33 1/3 rev/min. 3 and has radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the co-efficient of friction between the coins and the record is 0.15 which of the coins will revolve with the record ?

A coin is placed on the horizontal surface of a rotation disc. The distance of the coin from the axis is 1 m and coefficient of friction is 0.5. If the disc starts from rest and is given an angular acceleration (1)/(sqrt(2)) rad / sec^(2) , the number of revolutions through which the disc turns before the coin slips is

A block is placed on a horizontal table which can rotate about its axis.The block is placed at certain distance from centre as shown in figure. Table rotates such that particle does not slide. See possible direction of net acceleration of block at the instant shown in figure {:(,"Column-I","Column-II"),(,(A)"When rotation is clockwise with constant "omega,(P)1),(,(B)"When rotation is clock wise with decreasing "omega,(Q)2),(,(C)"When rotation is clockwise with increasing "omega,(R)3),(,(D)"Just after clockwise rotation beings from rest",(S)4):}

A disc is rotatin g aro u n d its cen tre in a horizontal plane at the rate of 60 rotation/ minute. A coin (1A^(st)) is placed at a distance of 18 cm and 2^(nd) similar coin 20 cm from its centre. The co-efficient of static friction between the disc and the coins is 0.2. Which coin will be thrown away from the disc ? Which coin will keep rotating with the disc ?

A box contains N coins, m of which are fair and the rest are biased. The probability of getting a head when a fair coin is tossed is 1/2 while it is 2/3 when a biased coin is tossed. A coin is drawn from the box at random and is tossed twice. The first time it shows head and the second time it shows tail. What is the probability that the coin drawn is fair?