A small cube is contained in a large cube as shown in figure 8.13.each corner of the small cube is attached to the corresponding corner of the large cube with an elastic string; this is a simple example of a spinor. Shown that the inner cube can be rotated through 360º and the string cannot be untangled but if the inner cube is rotated through 720º then the strings can be untangle?

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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