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Which of the following is not a derived force?

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Important Questions on Physical World

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Name the scientist and the country of his origin whose field of work was 'elasticity'.
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Name the scientist and the country of his origin whose field of work was ‘Cosmic Rays'.
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Name the scientist and the country of his origin whose field of work was 'measurement of electronic charge'.
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What is the scientific principle behind 'Aeroplane'?
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What is the scientific principle behind 'Optical fibres'?
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What is the range of weak nuclear force?
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What is the range of gravitational and electromagnetic force?
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Name the physicist who showed that the same laws of motion and the law of gravitation apply to celestial and terrestrial mechanics.