# Exercices sur les champs : Gravitation homework, Exercices de Principes fondamentaux de physique. Université Claude Bernard (Lyon I)

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Exercices de physique sur les champs : Gravitation homework. Les principaux thèmes abordés sont les suivants: exercices, questions.
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615-Champs : Gravitation homework (English)

. QUESTION 1

11 The planet Mars has two moons, Phobos and Deimos. Answering the following questions these three bodies should be assumed to be non-rotating homogeneous spheres. The radius of the circular orbit of Phobos is rP = 9,37.106 m and its period of orbit is TP = 0,319 days. Calculate the velocity vP of Phobos in its orbit.

12 Verify that the mass mM of Mars is 6,41.1023 kg. Given : Gravitational constant G = 6,67.10-11 N.m2.kg-2 Mass of Phobos mP = 2.1016 kg

13 The radius of the circular orbit of Deimos is rD = 2,35.107 m. Calculate its period of orbit TD.

QUESTION 2

21 At the surface of Phobos, both the gravitational field intensity gP due to Phobos and the gravitational field intensity gM due to Mars contribute to the resulting field intensity g. Calculate gP and gM.

22 Calculate the gravitational field intensity gA and gB at both sides of the Phobos surface. Sur un même rayon de Mars !

QUESTION 3

A meteorite passes Mars and intersects doing so the orbit of Deimos in D and of Phobos in P. Both moons are at such a large distance than they don't influence the velocity of the meteorite. In D the velocity of the meteorite amounts vm = 2,00 km/s. Calculate the velocity vm' of the meteorite in P.

Points : 3 - 4 - 5 - 4 - 4 - 5 / 25 points Duration : 55 min

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