Q. Seven pulleys are connected with the help of three light strings as shown in figure. Consider as light pulleys and pulleys and have masses each. For this arrangement, mark the correct statement(s).

Laws of Motion Report Error

Tension in the string connecting , and is zero.

Tension in the string connecting and is .

Tensions in all the three strings are same and equal to zero.

Acceleration of is downwards and that of is upwards.

Solution:

First of all, draw FBD of .
Let tensions, in three strings be and , respectively.

Now draw FBD of and .

So forces acting on and will be that of gravity and they will be in free fall. Hence, acceleration of each of them will be downwards.

Questions from Laws of Motion

1. A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction is 0.64, then the maximum velocity with which the car moves is

JIPMER 2013

2. A stone of mass is lying on the floor of a train which is accelerating with . The net force acting on the stone is

3. In the following figure, an object of mass is at rest at point . lf and are the reaction and the frictional force, respectively, then

AMU 2011

4. A bomb moving with velocity explodes into two pieces of mass ratio . After explosion the smaller piece moves away with velocity . The velocity of larger piece after explosion is

AIIMS 2018

5. A coin placed on a rotating table just slips if it is placed at a distance from the centre. If we double the angular velocity of the table, then the coin will just slip when it is away from the centre at a distance equal to

NTA Abhyas 2020

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids