Physics-
General
Easy
Question
The figure shown a semi-cylindrical massless gate pivoted at the point O holding a stationary liquid of density r. A horizontal force F is applied at its lowest position to keep it stationary The magnitude of the force is
- zero
The correct answer is: zero
Net torque = 0, hence force required = 0
Related Questions to study
physics-
The following figure depict the circular motion The radius of the circle, the period of revolution, the initial position and the sense of revolution are indicated on the figure The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is
The following figure depict the circular motion The radius of the circle, the period of revolution, the initial position and the sense of revolution are indicated on the figure The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is
physics-General
physics-
Four massless springs of force constant 2K, 2K, K and 2K are connected to a mass M lying on a smooth horizontal surface as shown in the figure. If the mass M is displaced horizontally through a small distance and released, the system will oscillate with a frequency
Four massless springs of force constant 2K, 2K, K and 2K are connected to a mass M lying on a smooth horizontal surface as shown in the figure. If the mass M is displaced horizontally through a small distance and released, the system will oscillate with a frequency
physics-General
physics-
The springs in fig. A and B are similar but length in A is three times each of that in B The ratio of period TA/TB is
The springs in fig. A and B are similar but length in A is three times each of that in B The ratio of period TA/TB is
physics-General
physics-
Block A in the figure is released from rest when the extension in the spring is x0 The maximum downward displacement of the block is :
Block A in the figure is released from rest when the extension in the spring is x0 The maximum downward displacement of the block is :
physics-General
physics-
A particle is moving in a force field given by potential 
from the point (1, 1, 1) to (2, 3, 4). The work done in the process is
A particle is moving in a force field given by potential from the point (1, 1, 1) to (2, 3, 4). The work done in the process is
physics-General
physics-
A man stretches a spring attached to the front wall of a railway carriage through a distance 
in time t opposite to the motion of the carriage , during which the train itself moved through L Then the work done by the man in a system fixed to the train will be :
A man stretches a spring attached to the front wall of a railway carriage through a distance in time t opposite to the motion of the carriage , during which the train itself moved through L Then the work done by the man in a system fixed to the train will be :
physics-General
physics-
A body of mass m sliding down a movable inclined plane of mass 2 m , assuming friction is absent everywhere the kinetic energy of 2 m as a function of time is :
A body of mass m sliding down a movable inclined plane of mass 2 m , assuming friction is absent everywhere the kinetic energy of 2 m as a function of time is :
physics-General
physics-
In the figure shown the velocity of platform while string is winding on the motor shaft with velocity 5 m/s will be :
In the figure shown the velocity of platform while string is winding on the motor shaft with velocity 5 m/s will be :
physics-General
physics-
Two blocks are arranged as shown in the figure The relation between acceleration a1 and a2 is :
Two blocks are arranged as shown in the figure The relation between acceleration a1 and a2 is :
physics-General
physics-
A particle P is moving on a circle under the action of only one force acting always towards fixed point O on the circumference . The ratio of 
and 
A particle P is moving on a circle under the action of only one force acting always towards fixed point O on the circumference . The ratio of and
physics-General
physics-
In the pulleys system as shown in the figure a particle of mass m falls from a height h0 on the mass m and gets stick to it. Speed with which the system moves just after the collision is
In the pulleys system as shown in the figure a particle of mass m falls from a height h0 on the mass m and gets stick to it. Speed with which the system moves just after the collision is
physics-General
physics-
A 10 kg block is pulled along a frictionless surface in the form of an arc of a circle of radius 10 m The applied force F is 200 N as shown in figure. If the block started from rest at P :
A 10 kg block is pulled along a frictionless surface in the form of an arc of a circle of radius 10 m The applied force F is 200 N as shown in figure. If the block started from rest at P :
physics-General
physics-
A square plate of mass m , length a is free to rotate about the axis XX¢ shown in figure . At a distance 
from an edge . If is released from horizontal position shown in figure , find the angular speed attained by the plate , when it will pass through vertical position .
A square plate of mass m , length a is free to rotate about the axis XX¢ shown in figure . At a distance from an edge . If is released from horizontal position shown in figure , find the angular speed attained by the plate , when it will pass through vertical position .
physics-General
physics-
A bob of mass m is suspended by a string from a train of mass M, free to move on a horizontal surface The bob is given a horizontal velocity V0 The maximum height attained by the bob is
A bob of mass m is suspended by a string from a train of mass M, free to move on a horizontal surface The bob is given a horizontal velocity V0 The maximum height attained by the bob is
physics-General
physics-
A small block is released from a point A of a rough semicircular track as shown in figure. When it moves along the track :
A small block is released from a point A of a rough semicircular track as shown in figure. When it moves along the track :
physics-General
