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Cambridge University. April 17, 2011. Acesso em 2011-04-23. 'The new study is based on earlier research which Professor Humphreys carried out with the Oxford astrophysicist, Graeme Waddington, in 1983. This identified the date of Jesus’ crucifixion as the morning of Friday, April 3rd, AD 33 – which has since been widely accepted by other scholars as well.
For Professor Humphreys, who only studies the Bible when not pursuing his day-job as a materials scientist, this presented an opportunity to deal with the equally difficult issue of when (e how) Jesus’ Last Supper really took place.' Hartnett, John; Luiten, ere (2011). Windows Server 2012 Install Language Pack. 'Colloquium: Comparison of Astrophysical and Terrestrial Frequency Steards'. Reviews of Modern Physics (Cornell University Library, Reviews of Modern Physics, vol. 83, 2011) 83: 1–9.:.:.:.
“ We have re-analyzed the stability of pulse arrival times from pulsars and white dwarfs using several analysis tools for measuring the noise characteristics of sampled time and frequency data. We show that the best terrestrial artificial clocks substantially exceed the performance of astronomical sources as time-keepers in terms of accuracy (as defined by cesium primary frequency steards) and stability.we show that detailed accuracy evaluations of modern terrestrial clocks imply that these new clocks are likely to have a stability better than any astronomical source up to comparison times of at least hundreds of years.” •.
(Parte 1 de 11) Chapter 21 The Electric Field 1: Discrete Charge Distributions Conceptual Problems *1 •• Similarities: Differences: The force between charges and masses varies as 1/r2. There are positive and negative charges but only positive masses.
The force is directly proportional to the product of the charges or masses. Like charges repel; like masses attract.
The gravitational constant G is many orders of magnitude smaller than the Coulomb constant k. 2 • Determine the Concept No. In order to charge a body by induction, it must have charges that are free to move about on the body. An insulator does not have such charges. 3 •• Determine the Concept During this sequence of events, negative charges are attracted from ground to the rectangular metal plate B.
When S is opened, these charges are trapped on B and remain there when the charged body is removed. Hence B is negatively charged and correct. Is )(c 4 •• (a) Connect the metal sphere to ground; bring the insulating rod near the metal sphere and disconnect the sphere from ground; then remove the insulating rod. The sphere will be negatively charged.
(b) Bring the insulating rod in contact with the metal sphere; some of the positive charge on the rod will be transferred to the metal sphere. First charge one metal sphere negatively by induction as in (a). Then use that negatively charged sphere to charge the second metal sphere positively by induction. Chapter 21 2 *5 •• Determine the Concept Because the spheres are conductors, there are free electrons on them that will reposition themselves when the positively charged rod is brought nearby.
Because charges +Q and −Q are equal in magnitude, the forces due to these charges are equal and their sum (the net force on +q) will be to the right and socorrect. Is )(e Note that the vertical components of these forces add up to zero. *7 • Determine the Concept The acceleration of the positive charge is given by.0 EFa r r mqm ==Because q0 and m are both positive, the acceleration is in the same direction as the electric field.
Is )(d Determine the Concept Er is zero wherever the net force acting on a test charge is zero. At the center of the square the two positive charges alone would produce a net electric field of zero, and the two negative charges alone would also produce a net electric field of zero.
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