Que pot passar quan una nau de 550 km de diàmetre i 1/4 de la massa de la Lluna s'acosta cap el nostre planeta? Estudiem les forces gravitatòries a partir de l'invasió aliènigena del film Independence day!!
Independence Day i les forces gravitatòries from Jesus Gasco on Vimeo.
dimecres, 28 de novembre del 2012
dimecres, 21 de novembre del 2012
EL MARTELL I LA PLOMA
Que caurà abans?
El martell o la ploma?
Eh...que aquest no és el repte!! Mirant el final del vídeo ja estaria resolt!!!
Però podries calcular la gravetat de la Lluna?
Per facilitar les coses us adjunto el text que acompanya la gravació extret de la web de la NASA:
At the end of the last Apollo 15 moon walk, Commander David Scott (pictured above) performed a live demonstration for the television cameras. He held out a geologic hammer and a feather and dropped them at the same time. Because they were essentially in a vacuum, there was no air resistance and the feather fell at the same rate as the hammer, as Galileo had concluded hundreds of years before - all objects released together fall at the same rate regardless of mass. Mission Controller Joe Allen described the demonstration in the "Apollo 15 Preliminary Science Report":
During the final minutes of the third extravehicular activity, a short demonstration experiment was conducted. A heavy object (a 1.32-kg aluminum geological hammer) and a light object (a 0.03-kg falcon feather) were released simultaneously from approximately the same height (approximately 1.6 m) and were allowed to fall to the surface. Within the accuracy of the simultaneous release, the objects were observed to undergo the same acceleration and strike the lunar surface simultaneously, which was a result predicted by well-established theory, but a result nonetheless reassuring considering both the number of viewers that witnessed the experiment and the fact that the homeward journey was based critically on the validity of the particular theory being tested.
Joe Allen, NASA SP-289, Apollo 15 Preliminary Science Report, Summary of Scientific Results, p. 2-11
I aquest és l'enllaç:
http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
El martell o la ploma?
Eh...que aquest no és el repte!! Mirant el final del vídeo ja estaria resolt!!!
Però podries calcular la gravetat de la Lluna?
Per facilitar les coses us adjunto el text que acompanya la gravació extret de la web de la NASA:
At the end of the last Apollo 15 moon walk, Commander David Scott (pictured above) performed a live demonstration for the television cameras. He held out a geologic hammer and a feather and dropped them at the same time. Because they were essentially in a vacuum, there was no air resistance and the feather fell at the same rate as the hammer, as Galileo had concluded hundreds of years before - all objects released together fall at the same rate regardless of mass. Mission Controller Joe Allen described the demonstration in the "Apollo 15 Preliminary Science Report":
During the final minutes of the third extravehicular activity, a short demonstration experiment was conducted. A heavy object (a 1.32-kg aluminum geological hammer) and a light object (a 0.03-kg falcon feather) were released simultaneously from approximately the same height (approximately 1.6 m) and were allowed to fall to the surface. Within the accuracy of the simultaneous release, the objects were observed to undergo the same acceleration and strike the lunar surface simultaneously, which was a result predicted by well-established theory, but a result nonetheless reassuring considering both the number of viewers that witnessed the experiment and the fact that the homeward journey was based critically on the validity of the particular theory being tested.
Joe Allen, NASA SP-289, Apollo 15 Preliminary Science Report, Summary of Scientific Results, p. 2-11
I aquest és l'enllaç:
http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
dissabte, 17 de novembre del 2012
TORNEM-HI!!!
Ei...
No, no hem estat de vacances fins ara, no ens hem oblidat dels superherois...simplement és que nosaltres no tenim els seus poders... o si?
Tan se val, la qüestió és que aviat tindrem un nou repte...un que parli d'estrelles...i per fer boca un fragment de la primera obra de Johannes Kepler, Mysterium Cosmographicum (1596):
"No ens qüestionem quin propòsit útil amaga el cant dels ocells, cantar és el seu desig des que van ser creats per cantar. De la mateixa manera no hem de preguntar-nos per què la ment humana es preocupa per endinsar-se en els secrets dels cels... La diversitat dels fenòmens de la natura és tan gran i els tresors que contenen els cels tan rics precisament perquè la ment de l'home mai no es trobi del se aliment bàsic"*
No us venen ganes de sortir aquesta nit i contemplar els secrets que s'amaguen darrera de les estrelles?
No, no hem estat de vacances fins ara, no ens hem oblidat dels superherois...simplement és que nosaltres no tenim els seus poders... o si?
Tan se val, la qüestió és que aviat tindrem un nou repte...un que parli d'estrelles...i per fer boca un fragment de la primera obra de Johannes Kepler, Mysterium Cosmographicum (1596):
"No ens qüestionem quin propòsit útil amaga el cant dels ocells, cantar és el seu desig des que van ser creats per cantar. De la mateixa manera no hem de preguntar-nos per què la ment humana es preocupa per endinsar-se en els secrets dels cels... La diversitat dels fenòmens de la natura és tan gran i els tresors que contenen els cels tan rics precisament perquè la ment de l'home mai no es trobi del se aliment bàsic"*
No us venen ganes de sortir aquesta nit i contemplar els secrets que s'amaguen darrera de les estrelles?
* Fragment extret del llibre "Física i ciència-ficció" de J. José i M. Moreno
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