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We have take a dynamometer of 1 N, and suspended an object of 100g, and measured the force in and out water. Then, we have compared the results.

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The volume of water was higher, and the final weight was lower. Conclusion : we have proved that there is a force, a resistance of the water

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It is the vertical force that any body immersed in a fluid at rest undergoes, it is directed from below upwards.

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Tides are variations of height of the sea, which make goes up or goes down the sea. In one day, there are two high, and two low tides, separated by six hours. This phenomenon is due to the rotation of the Moon around our planet, et the one of the Earth around the Sun, but also to the force there is between the Earth and the Moon, the Moon and the Sun, and the Earth and the Sun as well.

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Vacuum is when there are nothing, it's empty

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The Universe is everything, the stars, the planets, the galaxies but also black holes

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Gravity is what keeps us on the ground, so that two masses attract.

Gravitation is the attraction between two bodies which have a mass.

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I chose to talk about Patricia Boyd because she is a very intelligent woman, who loves her job, and yet still has a lot of humor. She seems to be really nice and wants to share her passion.

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Patricia Boyd was born in Perth Amboy, New Jersey. As a child, she was not interested in science, but rather in art. It is only in the last year of high school that she begins to take an interest in astronomy. She studied physics at Drexel University and received her Ph.D. She is now working as a USRA (Universities Space Research Association) contractor for the Rossi X-ray Timing Explorer mission. The main objective of this "machine" is to study the different phenomena of compact objects in the field of X-rays.