QUES: General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum. Noether's theorem allows these quantities to be determined from a Lagrangian with translation invariance, but general covariance makes translation invariance into something of a gauge symmetry. The energy and momentum derived within general relativity by Noether's presecriptions do not make a real tensor for this reason. Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates. He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field. This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard. The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others.
Do you have any questions?
MY QUESTION: Did Landau use dynamical spacetime in his theory, if not, what?

QUES: At 8:38, Ong told Gonzalez that the plane was flying erratically again. Around this time Sweeney told Woodward that the hijackers were Middle Easterners, naming three of their seat numbers. One spoke very little English and one spoke excellent English. The hijackers had gained entry to the cockpit, and she did not know how. The aircraft was in a rapid descent. At 8:41, Sweeney told Woodward that passengers in coach were under the impression that there was a routine medical emergency in first class. Other flight attendants were busy at duties such as getting medical supplies while Ong and Sweeney were reporting the events. At 8:41, in American's operations center, a colleague told Marquis that the air traffic controllers declared Flight 11 a hijacking and "think he's [American 11] headed toward Kennedy [airport in New York City]. They're moving everybody out of the way. They seem to have him on a primary radar. They seem to think that he is descending." At 8:44, Gonzalez reported losing phone contact with Ong. About this same time Sweeney reported to Woodward, "Something is wrong. We are in a rapid descent . we are all over the place." Woodward asked Sweeney to look out the window to see if she could determine where they were.
Do you have any questions?
MY QUESTION: How, according to Sweeney, hijackers gained entry to the cockpit?

QUES: How would the universe look without gravity? It would have no planets and no stars. Thats how it looked when it was young. When the universe was young, there was only gas and dust. From this gas and dust, everything we now see was made. How were stars and planets created from just gas and dust? The answer is gravity. The same gravity that holds you down on Earth. The same force that causes your pencil to roll off your desk. The same force that causes it to fall to the floor. The invisible force of gravity caused dust and gas particles to be pulled together. This force is what formed all the objects in our solar system. This force formed the smallest moons. It also formed our Sun. This force caused more than just our solar system to form. It caused all the other solar systems to form. It caused the formation of all the galaxies of the universe.
Do you have any questions?
MY QUESTION: How would the universe look without gravity?

QUES: The opening shot of the movie shows Kunti praying for Lord Krishna's protection for the Pandavas . Lord Krishna consoles Kunti and promises to ever protect the Pandavas and guide them through troubles and problems that may occur in life . The sons of Pandu and Dhritarashtra progeny break into an argument . When Duryodhana insults the Pandavas as '' dependents '' , Bheema counters by saying that , the Kauravas are the progeny of a widow . Duryodhana asks Veda Vyasa for an explanation . He is then told that , since his mother , Gandhari had an astrological defect , she is first married of to a goat and then married to his father . Duryodhana gains animosity towards the kingdom of Gandhara where the king , the father of his mother Gandhari , rules . He attacks Gandhara and lays waste of the whole kingdom . He them imprisons the royal family in his prison . He gives them only one rice grain per prisoner . The king of Gandhara then stops everyone from grabbing the little food that is provided . He says that instead of everyone dying , they could keep at least one of their princes alive . He chooses Sakuni to be alive . Sakuni takes an oath that he will do everything he can to destroy the entire Kaurava clan . He makes magic dice from his father's spinal cord . The magic dice show exactly the number that he would want . Duryodhana takes pity on the lone prisoner , Sakuni after the rest of the Gandhara royal family dies in prison out of starvation . Sakuni joins the evil of coterie of Duryodhana , Karna and Dushyasana .
Do you have any questions?
MY QUESTION:
Who is praying in the opening shot of the movie, and does someone answer his prayers?