a force of 40 N is applied perpendicular to the edge of the door 1.5 metre wide then the moment of force about hinge is

A force of 60 N acting perpendicular to a force of 80 N can produce

A disc of radius 10 cm can rotate about an axis passing through its centre and perpendicular to its plane. A force of 10 N is applied along the tangent in the plane of the disc. If the moment of inertia of the disc about its centre is 5 kg m^(2) , then the increase in the angular velocity of the disc in 10 s will be

The length of a spring is alpha when a force of 4N is applied on it and the length is beta when 5N is applied. Then the leng of spring when 9 N force is applied is-

A uniform rod of mass M = 2 kg and length L is suspended by two smooth hinges 1 and 2 as shown in Fig. A force F = 4 N is applied downward at a distance L//4 from hinge 2 . Due to the application of force F , hinge 2 breaks. At this instant, applied force F is also removed. The rod starts to rotate downward about hinge 1 . ( g = 10 m//s^(2) ) The reaction at hinge 1 , before hinge 2 breaks, is

A 2kg block is in contact with a vertical wall having coefficient of friction 0.5 between the surfaces. A horizontal force of 40N is applied on the block at right angles to the wall. Another force of 15N is applied on the plane of the wall and at right angles to 40N force. Find the acclecration of the block .

A uniform rod of mass M = 2 kg and length L is suspended by two smooth hinges 1 and 2 as shown in Fig. A force F = 4 N is applied downward at a distance L//4 from hinge 2 . Due to the application of force F , hinge 2 breaks. At this instant, applied force F is also removed. The rod starts to rotate downward about hinge 1 . ( g = 10 m//s^(2) ) The acceleration of the end point of the rod of small mass dm at the end point of the rod, when the rod becomes vertical is