-
Posts
894 -
Joined
-
Last visited
Content Type
Profiles
Forums
Events
Everything posted by granpa
-
Why light can't escape a Black Hole's gravity?
granpa replied to morgsboi's topic in Modern and Theoretical Physics
teh force of gravity at the event horizon is not infinite. -
Why light can't escape a Black Hole's gravity?
granpa replied to morgsboi's topic in Modern and Theoretical Physics
light may or may not be affected by gravity but it is certainly affected by gravitational time dilation. time stops completely at the event horizon. -
By em3ryguy at 2011-07-14
-
once birds evolved flowering plants evolved. birds have to reduce weight so their digestive tracts are short and dont fully digest seeds. once these plants had a way to disperse their seeds the next problem was fertilizing the flower. http://en.wikipedia.org/wiki/Bee#Evolution Bees, like ants, are a specialized form of wasp. The ancestors of bees were wasps in the family Crabronidae, and therefore predators of other insects. The switch from insect prey to pollen may have resulted from the consumption of prey insects which were flower visitors and were partially covered with pollen when they were fed to the wasp larvae. This same evolutionary scenario has also occurred within the vespoid wasps, where the group known as "pollen wasps" also evolved from predatory ancestors. Up until recently, the oldest non-compression bee fossil had been Cretotrigona prisca in New Jersey amber and of Cretaceous age, a meliponine. A recently reported bee fossil, of the genus Melittosphex, is considered "an extinct lineage of pollen-collecting Apoidea sister to the modern bees", and dates from the early Cretaceous (~100 mya).[14] Derived features of its morphology ("apomorphies") place it clearly within the bees, but it retains two unmodified ancestral traits ("plesiomorphies") of the legs (two mid-tibial spurs, and a slender hind basitarsus), indicative of its transitional status. The earliest animal-pollinated flowers were pollinated by insects such as beetles, so the syndrome of insect pollination was well established before bees first appeared. The novelty is that bees are specialized as pollination agents, with behavioral and physical modifications that specifically enhance pollination, and are generally more efficient at the task than any other pollinating insect such as beetles, flies, butterflies and pollen wasps. The appearance of such floral specialists is believed to have driven the adaptive radiation of the angiosperms, and, in turn, the bees themselves. Among living bee groups, the "short-tongued" bee family Colletidae has traditionally been considered the most "primitive", and sister taxon to the remainder of the bees. In the 21st century, however, some researchers have claimed that the Dasypodaidae is the basal group, the short, wasp-like mouthparts of colletids being the result of convergent evolution, rather than indicative of a plesiomorphic condition.[1] This subject is still under debate, and the phylogenetic relationships among bee families are poorly understood.
-
http://en.wikipedia.org/wiki/Homo_erectus Homo erectus (from the Latin ērĭgĕre, "to put up, set upright") is an extinct species of hominid that lived from the end of the Pliocene epoch to the later Pleistocene, about 1.8 to 1.3 million years ago
-
http://en.wikipedia.org/wiki/Ancient_Greek_flood_myths Greek mythology knows four floods, the sinking of Atlantis, the flood of Dardanus, the flood of Ogyges, and the flood of Deucalion. Two of these ended two of the Ages of Man: the Ogygian Deluge ended the Silver Age, and the flood of Deucalion ended the First Bronze Age http://www.uib.es/depart/dctweb/LuisPomar/Luis/GreatFlood-controversy.pdf Controversy over the great flood hypotheses in the Black Sea in light of geological, paleontological, and archaeological evidence
-
if you and the person in andromeda are stationary with respect to each other then you are both in each others present.
-
go troll someone else.
- 16 replies
-
-2
-
human beings go back at least 1.5 million years
-
http://en.wikipedia.org/wiki/Australasian_strewnfield The Australasian strewnfield, covering at least one-tenth of the Earth's surface, is the largest and the youngest of the tektite strewnfields. The 800,000 year-old strewnfield includes most of Southeast Asia (Vietnam, Thailand, Southern China, Laos and Cambodia). The material from the impact stretches across the ocean to include the islands of the Philippines, Indonesia, Malaysia and Java and reaches far out into the Indian Ocean and south to the western side of Australia. The impact crater may have been between 32 and 114 kilometres in diameter. Also, some recent estimates suggest that the strewn field may cover 30% of the earths surface (Povenmire et al.).
-
as bad as toba was it pales in comparison to whatever caused these: http://en.wikipedia.org/wiki/Tektite http://en.wikipedia.org/wiki/Australite
-
then whats the question?
-
what do you mean by timed remotely? you mean you measure how much time each records?
-
its not a strange question at all. http://www.iopb.res.in/~phatak/relativity/node75.html A direct measurement of gravitational time dilation requires measurement of time delays between two clocks which are placed at different gravitational potentials. An example would be two clocks, one placed in a satelite and another on the surface of Earth. Let us compute the difference between two clocks, one placed on Earth and another at a distance of twice the radius of Earth That is, in a day the two clocks will show a time difference of about 30 microseconds in one day. Such small time differences can be observed in atomic clocks. http://www.physicsforums.com/showthread.php?t=58359 escape velocity of earth = 10 km/s (actually its 11.18 kilometers per second) at that velocity gamma = 1.000,000,000,556,325,2 gamma calculator http://www.1728.org/reltivty.htm
-
http://consumerist.com/2008/12/cheat-sheet-for-sketchy-food-expiration-codes.html
-
my point was that maybe God isnt 'all knowing' but rather just 'always knowing'.
-
the gods are said to be 'all knowing'. Now, I would 'THINK' that it is going to rain tomorrow when I could 'KNOW' that it might rain tomorrow because it takes less mental energy for me to think than it does to know. Maybe an Elohim or a 'son of Elohim' is simply a being that has limitless mental energy and is therefore always knowing.
-
the radius is determined by ħ, the angular momentum of the electron. http://en.wikipedia.org/wiki/Planck_constant http://en.wikipedia.org/wiki/Bohr_model
-
Do black holes have singularities?
granpa replied to GrandMasterK's topic in Modern and Theoretical Physics
http://www.google.com/search?hl=en&client=firefox-a&hs=ePH&rls=org.mozilla:en-US:official&q=neutron+star+miles -
the answer is 'changing the dilectric constant'.
-
In semiconductors, the dielectric constant is generally large. Consequently, electric field screening tends to reduce the Coulomb interaction between electrons and holes. The result is a Wannier exciton,[4] which has a radius larger than the lattice spacing. As a result, the effect of the lattice potential can be incorporated into the effective masses of the electron and hole. Likewise, because of the lower masses and the screened Coulomb interaction, the binding energy is usually much less than a hydrogen atom, typically on the order of 0.01eV. This type of exciton was named for Gregory Wannier and Nevill Francis Mott. Wannier-Mott excitons are typically found in semiconductor crystals with small energy gaps and high dielectric constant
-
read the article again
-
http://en.wikipedia.org/wiki/Exciton