4. A sleeve of mass M = 10 kg can slide on a horizontal frictionless rod. A block of mass m = 2.0 kg is suspended at the mid-point of a light inextensible cord of length 1= 102.5 cm, one end of which is attached to the sleeve and the ther to one end of the rod. Initially the sleeve is held at rest and the angle between the rod and a cord segment is 63 = sin (0.8) as show. in the figure. If a constant horizontal force F= 50 N is applied on the sieeve, find its speed when the angle between cord segments and the rod becomes 0= sin !(0.6)? m/e

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.