New PDF release: Astronomy and astrophysics: recent developments: proceedings

By A.M. Mourao, Jose P. S. Lemos, Ana M. Mourao, Luis Teodoro, Roberto Ugoccioni

ISBN-10: 9810246994

ISBN-13: 9789810246990

This quantity discusses some of the contemporary theoretical and observational advancements that experience major implications for astronomy and astrophysics. the most topics are (i) cosmology, (ii) gravitational wave astronomy and gravitational physics, (iii) stellar astrophysics, and (iv) lively galactic nuclei and disk accretion. There also are contributions at the sun procedure.

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Extra info for Astronomy and astrophysics: recent developments: proceedings of the 10th Portuguese meeting: CENTRA, Lisbon, Portugal, 27-28 July 2000

Sample text

A circular disc of mass 500 gm. and of radius io cm. is suspended by a wire through its centre perpendicular to its plane. 4 sec. 7 sec. From these observations obtain a value for the moment of inertia of the annulus about the axis of rotation. 80. Given the moment of inertia of a uniform lamina about an axis through its centre of gravity, show how to obtain its moment of inertia (a) about a parallel axis in the plane of the lamina, (b) about a perpendicular axis through its centre of gravity. Compare the times of oscillation of a uniform disc when oscillating about an axis on its circumference (i) parallel, (ii) perpendicular, to the plane of the disc.

What is Young's modulus of elasticity for a wire of diameter o•5 mm. which is stretched by o•I per cent, of its initial length by a load of 4 kgm. wt. 2. Define Young's modulus of elasticity and describe how you would find its value experimentally for a metal available in the form of a wire. , will extend it by 2 mm. 2 (g = 981 cm. 2) 3. Define : yield point, permanent set, elastic limit. Describe the behaviour of a wire that is gradually loaded to breakingpoint. Identical loads are attached to two wires, A and B, which have the same initial length.

Per sec. On reversing the electric field the drop rises at the steady rate of o•r mm. per sec. u. s. units. ] Give a description of the method of determining the electronic charge by experiments on oil drops. A charged oil drop, falling under gravity between two hori- GRAVITATION 41 zontal metal plates 3 cm. apart, was observed to descend at a steady rate of 0•12 mm. per sec. When a potential difference of 8000 volts was applied across the plates, the descent of the oil drop was arrested. Calculate (a) the radius of the drop, (b) the charge on it.

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Astronomy and astrophysics: recent developments: proceedings of the 10th Portuguese meeting: CENTRA, Lisbon, Portugal, 27-28 July 2000 by A.M. Mourao, Jose P. S. Lemos, Ana M. Mourao, Luis Teodoro, Roberto Ugoccioni


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