Home
Class 11
PHYSICS
A pulley systemis attached to a massless...

A pulley systemis attached to a massless board as shown below. The board pivots only at the pivot point. A `10 g` mass `M` sits exaxtly in the middle of the board. If the angle `theta` is `60^@`, what is the force `F(i n N)` necessary to hold the board in the position shown.
.

Text Solution

Verified by Experts

The correct Answer is:
`25 N`
Balancing the torque about pivot
`2F l = Mg(l)/(2)`
`F = (Mg)/(4) rArr F = 25 N`.
Promotional Banner

Similar Questions

Explore conceptually related problems

A mass m is attached to a rigid rod of negligible mass as shown in figure. The system is pivoted at point O and rotates about the indicated z -axis with angular velocity vec(omega) , maintaining a fixed angle theta with the axis.

A uniform bar of mass m is supported by a pivot at its top about which the bar can swing like a pendulum. If a force F is applied perpendicular to the lower end of the bar as shown in figure, what is the value of F in order to hold the bar in equilibrium at an angle (theta) from the vertical

Board A is placed on board B as shown. Both boards slide, without moving with respect to each other, along a frictionless horizontal surface at a speed 6 m/ s. Board B hits a resulting board C "head·on". After the collision, board B and C stick together and board A slides on top of board C and stops its motion relative to C in the position shown on the diagram. What is the length (in m) of each board? All three boards have the same mass, size and shape. The coefficient of kinetic friction between boards A and C and between board A & B is 0.3

One end of a string of length 1.5 m is tied to a stone of mass 0.4 kg and the other end to a small pivot on a smooth vertical board. What is the minimum speed of the stone required at its lower most point so that the string does not slack at any point in its motion along the vertical circle ?

A simple pendulum consisting of a mass M attached to a string of length L is released from rest at an angle alpha . A pin is located at a distance l below the pivot point. When the pendulum swings down, the string hits the pin as shown in figure. The maximum angle theta which the string makes with the vertical after hitting the pin is

STATEMENT-1: One end of a string of length r is tied to a stone of mass m and the other end to a small pivot on a frictionless vertical board. The stone is whirled in a vertical circle with the pivot as the centre. The minimum speed the stone must have, when it is at the topmost point on the circle, so that the string does not slack is sqrt( gR) . because STATEMENT-2: At the topmost point on the circle, the centripetal force is provided partly by tension in the string and partly by the weight of the stone.

In figure the tension in the diagram string is 60 N (a) Find the magnitude of the horizontal force F_(1) and F_(2) that must be applied to hold the system In the position shown. (b) What is the weight of the suspended block?