A weight of 1000g hangs from a lever 20cm to the right of the fulcrum. At the left is a 500g weight 20cm from the fulcrum. If a 200g weight is Ycm away from the fulcrum, what is the value of Y that will make the lever balance?
Which of the following is in a neutral equilibrium?
The limiting frictional force between two surfaces depends on
I. the normal reaction between the surfaces
II. the area of surfaces in contact
III. the relative velocity between the surfaces
IV. the nature of the surfaces
Which of the following statements about friction is INCORRECT?
A small trolley is set in motion on a horizontal surface by a force of 250N applied by means of a rope inclined at an angle of 20° to the horizontal. What horizontal force may be used instead?
A man standing on a lift that is descending does not feel any weight because
A 1000kg elevator is descending vertically with an acceleration of 1m/s². If the acceleration due to gravity is 10m/s², the tension in the suspending cable is
A wooden block of weight 16N is placed on a rough surface. If the co-efficient of friction between both surfaces is 0.25, the least horizontal force required to move the block is
A load is pulled at a uniform speed along a horizontal floor by a rope at 45° to the floor. If the force in the rope is 1500N, what is the frictional force on the load?
A body of weight W rests on a smooth plane inclined at an angle of θ° to the horizontal. What is the resolved part of the weight in Newtons along the plane?
A body of mass 4kg is on the point of slipping down a plane which is inclined at 30° to the horizontal. What force, parallel to the plane, will just move it up the plane?
(g = 10m/s²)
A block of mass 2kg resting on a smooth horizontal plane is acted upon simultaneously by two forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the forces on the block is
Two forces of magnitude 7N & 3N act at right angles to each other. The angle θ between resultant and the 7N force is given by
Tara pushes a 500kg box along a floor with a force of 2000N. If the velocity of the box is uniform, the coefficient of friction between the box and the floor is.
(g = 10m/s²)
The co-efficient of static friction between a 40kg crate and a concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45° to the horizontal (g = 10m/s²)
A boat is towed with a net force of 16000N acting at an angle of 60º to the water surface. If the boat moves with an acceleration of 20m/s², calculate its mass.