A car, assumed to be rigid and having a mass of 800 kg, strikes a barrel-barrier installation without the driver applying the brakes. From experiments, the magnitude of the force of resistance Fr, created by deforming the barrels successively, is sho ?->(Show Answer!)

1. A car, assumed to be rigid and having a mass of 800 kg, strikes a barrel-barrier installation without the driver applying the brakes. From experiments, the magnitude of the force of resistance Fr, created by deforming the barrels successively, is shown as a function of vehicle penetration. If the car strikes the barrier traveling at Vc = 70 km/h, determine approximately the distance s to which the car penetrates the barrier.

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MCQ->In this question, a passage is given followed by a statement. Read the passage carefully and judge the statement based on the given passage.The strong olfactory sense elephants ar e known for has come as a blessing in disguise for the police in curbing illicit liquor trade in Uttarakhand’s Udham SinghNagar district. The animals find lahan, the substance used for brewing liquor, hidden in forests of Khatima in the district, and destroy them. Manufacturers brew it near nullahsdeep inside the forests or near the villages to avoid police raids as flowing water is required for fermentation.Lahan is sealed in barrels or polythene bags and buried for four to five days for fermentation. Elephants reach the spot by smelling the substance and destroy the barrels to consume the liquor, said Yogesh Upadhaya, inspector, Khatima police station. He said some traders keep the barrels on scaffoldings on trees but they are easily spotted by the police. “We have destroyed thousand litres of lahan in the past 23 months. They were stored in barrels on scaffoldings,” said Yogesh Upadhyay, inspector. “Miscreants place barrels of lahan on trees to keep them away from elephants. Elephants find them and destroy the barrels to consume the substance, causing heavy loss to the manufacturers,” he added. A villager, said: “The liquor is sold for Rs 80 to 100 per litre in villages. Since it is cheaper than liquor available in the market, people buy it even after knowing its impact on health. Elephants are playing vital role in curbing the trade.” Statement: Lahan is one of the costliest liquor that is available.Choose the appropriate one from the following options A The statement is definitely true. B The statement is probably true. C The statement cannot be determ ined. D The statement is definitely false.....

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But with Newton all the resources of mathematics were turned to advantage in the solution of physical problems. Thenceforth mathematics appeared as an instrument of discovery, the most powerful one known to man, multiplying the power of thought just as in the mechanical domain the lever multiplied our physical action. It is this application of mathematics to the solution of physical problems, this combination of two separate fields of investigation, which constitutes the essential characteristic of the Newtonian method. Thus problems of physics were metamorphosed into problems of mathematics.But in Newton’s day the mathematical instrument was still in a very backward state of development. In this field again Newton showed the mark of genius by inventing the integral calculus. As a result of this remarkable discovery, problems, which would have baffled Archimedes, were solved with ease. We know that in Newton’s hands this new departure in scientific method led to the discovery of the law of gravitation. But here again the real significance of Newton’s achievement lay not so much in the exact quantitative formulation of the law of attraction, as in his having established the presence of law and order at least in one important realm of nature, namely, in the motions of heavenly bodies. Nature thus exhibited rationality and was not mere blind chaos and uncertainty. To be sure, Newton’s investigations had been concerned with but a small group of natural phenomena, but it appeared unlikely that this mathematical law and order should turn out to be restricted to certain special phenomena; and the feeling was general that all the physical processes of nature would prove to be unfolding themselves according to rigorous mathematical laws.When Einstein, in 1905, published his celebrated paper on the electrodynamics of moving bodies, he remarked that the difficulties, which surrouned the equations of electrodynamics, together with the negative experiments of Michelson and others, would be obviated if we extended the validity of the Newtonian principle of the relativity of Galilean motion, which applies solely to mechanical phenomena, so as to include all manner of phenomena: electrodynamics, optical etc. When extended in this way the Newtonian principle of relativity became Einstein’s special principle of relativity. Its significance lay in its assertion that absolute Galilean motion or absolute velocity must ever escape all experimental detection. Henceforth absolute velocity should be conceived of as physically meaningless, not only in the particular ream of mechanics, as in Newton’s day, but in the entire realm of physical phenomena. Einstein’s special principle, by adding increased emphasis to this relativity of velocity, making absolute velocity metaphysically meaningless, created a still more profound distinction between velocity and accelerated or rotational motion. This latter type of motion remained absolute and real as before. It is most important to understand this point and to realize that Einstein’s special principle is merely an extension of the validity of the classical Newtonian principle to all classes of phenomena.According to the author, why did the Greeks NOT conduct experiments to understand the physical world?
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