Question about Einstein postulates and relativity:
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From: Androcles on 12 Apr 2010 05:03 "Khattak" <zarmewa(a)gmail.com> wrote in message news:18eb13b9-ecf4-4757-b12c-5d4f74071f16(a)u31g2000yqb.googlegroups.com... > Let a spaceship of width 30, 00,000 km No such animal as 30, 00,000 km exists and length say 10 meter > (adjusted with length contraction) is moving with 0.9c. Let a beam of > light/ pulse is moving perpendicular to the direction of spaceship. > For simplicity assume a pulse of light travel from north to south and > spaceship is moving from east to west. After sometime the same pulse > of light > Strikes and enters spaceship through its one longitudinal side of 10 m > Travel inside spaceship and then > Leaves the spaceship through its other longitudinal side > Can we trace the path of pulse for both inside and outside observer > while keeping in mind the Einstein postulates? Thanks
From: dlzc on 12 Apr 2010 10:41 Dear Inertial: On Apr 11, 9:47 pm, "Inertial" <relativ...(a)rest.com> wrote: > "dlzc" <dl...(a)cox.net> wrote in message > news:9517f193-906f-4a91-b7c8-4221182a2cd8(a)h27g2000yqm.googlegroups.com... > > On Apr 11, 9:08 pm, Khattak <zarm...(a)gmail.com> wrote: > >> Let a spaceship of width 30, 00,000 km and length > >> say 10 meter (adjusted with length contraction) > >> is moving with 0.9c. Let a beam of light/ pulse is > >> moving perpendicular to the direction of spaceship. > >> For simplicity assume a pulse of light travel from > >> north to south and spaceship is moving from east > >> to west. After sometime the same pulse of light > >> Strikes and enters spaceship through its one > >> longitudinal side of 10 m Travel inside spaceship > >> and then Leaves the spaceship through its other > >> longitudinal side > >> Can we trace the path of pulse for both inside > >> and outside observer while keeping in mind the > >> Einstein postulates? Thanks > > > Yes. Inside the ship it moves straight north > > south. > > Nope .. not from the description given. There > will be aberration. From the description given (other than what he means by "longitudinal"), the light enters on either north or south face, and proceeds to exit on south or north face. What room for "aberration" do you see for an observer that is inside the ship for the entire event? > > Outside the ship > > (at rest), it moves along with the ship... > > and north and south. > > Outside the ship it moves the same as inside > the ship, from the same observers point of view. It isn't clear what motion his outside observer has wrt the ship. Perhaps the ship's length is contracted to 10m for this person. The setup is unclear. > > And here I thought you were going to start this joke... > >http://www.supercubs.org/phpbb2/viewtopic.php?t=4958 > > Not a very funny joke, if it was meant as one at all. It is. And an old one too. I managed to find one version that did not disparage one ethnicity. > Unless I missed something humorous in it. He landed sideways on the runway. The runway is very short, but it sure is wide... David A. Smith
From: Khattak on 16 Apr 2010 02:12 On Apr 12, 8:41 am, dlzc <dl...(a)cox.net> wrote: > Dear Inertial: > > On Apr 11, 9:47 pm, "Inertial" <relativ...(a)rest.com> wrote: > > > > > > > "dlzc" <dl...(a)cox.net> wrote in message > >news:9517f193-906f-4a91-b7c8-4221182a2cd8(a)h27g2000yqm.googlegroups.com.... > > > On Apr 11, 9:08 pm, Khattak <zarm...(a)gmail.com> wrote: > > >> Let a spaceship of width 30, 00,000 km and length > > >> say 10 meter (adjusted with length contraction) > > >> is moving with 0.9c. Let a beam of light/ pulse is > > >> moving perpendicular to the direction of spaceship. > > >> For simplicity assume a pulse of light travel from > > >> north to south and spaceship is moving from east > > >> to west. After sometime the same pulse of light > > >> Strikes and enters spaceship through its one > > >> longitudinal side of 10 m Travel inside spaceship > > >> and then Leaves the spaceship through its other > > >> longitudinal side > > >> Can we trace the path of pulse for both inside > > >> and outside observer while keeping in mind the > > >> Einstein postulates? Thanks > > > > Yes. Inside the ship it moves straight north > > > south. > > > Nope .. not from the description given. There > > will be aberration. > > From the description given (other than what he means by > "longitudinal"), the light enters on either north or south face, and > proceeds to exit on south or north face. What room for "aberration" > do you see for an observer that is inside the ship for the entire > event? > > > > Outside the ship > > > (at rest), it moves along with the ship... > > > and north and south. > > > Outside the ship it moves the same as inside > > the ship, from the same observers point of view. > > It isn't clear what motion his outside observer has wrt the ship. > Perhaps the ship's length is contracted to 10m for this person. The > setup is unclear. > > > > And here I thought you were going to start this joke... > > >http://www.supercubs.org/phpbb2/viewtopic.php?t=4958 > > > Not a very funny joke, if it was meant as one at all. > > It is. And an old one too. I managed to find one version that did > not disparage one ethnicity. > > > Unless I missed something humorous in it. > > He landed sideways on the runway. The runway is very short, but it > sure is wide... > > David A. Smith- Hide quoted text - > > - Show quoted text - > It isn't clear what motion his outside observer has wrt the ship. > Perhaps the ship's length is contracted to 10m for this person. The > setup is unclear. An outside observer is at rest on asteriod.
From: harald on 16 Apr 2010 04:05 On Apr 12, 6:36 am, dlzc <dl...(a)cox.net> wrote: > On Apr 11, 9:08 pm, Khattak <zarm...(a)gmail.com> wrote: > > > Let a spaceship of width 30, 00,000 km and length > > say 10 meter (adjusted with length contraction) > > is moving with 0.9c. Let a beam of light/ pulse is > > moving perpendicular to the direction of spaceship. > > For simplicity assume a pulse of light travel from > > north to south and spaceship is moving from east > > to west. After sometime the same pulse of light > > Strikes and enters spaceship through its one > > longitudinal side of 10 m Travel inside spaceship > > and then Leaves the spaceship through its other > > longitudinal side > > Can we trace the path of pulse for both inside > > and outside observer while keeping in mind the > > Einstein postulates? Thanks > > Yes. Inside the ship it moves straight north south. Outside the ship > (at rest), it moves along with the ship... and north and south. > > And here I thought you were going to start this joke...http://www.supercubs.org/phpbb2/viewtopic.php?t=4958 > > David A. Smith Good one! :))) Harald
From: Inertial on 16 Apr 2010 10:29
"dlzc" <dlzc1(a)cox.net> wrote in message news:75ba566a-e18d-4922-8906-982ed5fd2446(a)g11g2000yqe.googlegroups.com... > Dear Inertial: > > On Apr 11, 9:47 pm, "Inertial" <relativ...(a)rest.com> wrote: >> "dlzc" <dl...(a)cox.net> wrote in message >> news:9517f193-906f-4a91-b7c8-4221182a2cd8(a)h27g2000yqm.googlegroups.com... >> > On Apr 11, 9:08 pm, Khattak <zarm...(a)gmail.com> wrote: >> >> Let a spaceship of width 30, 00,000 km and length >> >> say 10 meter (adjusted with length contraction) >> >> is moving with 0.9c. Let a beam of light/ pulse is >> >> moving perpendicular to the direction of spaceship. >> >> For simplicity assume a pulse of light travel from >> >> north to south and spaceship is moving from east >> >> to west. After sometime the same pulse of light >> >> Strikes and enters spaceship through its one >> >> longitudinal side of 10 m Travel inside spaceship >> >> and then Leaves the spaceship through its other >> >> longitudinal side >> >> Can we trace the path of pulse for both inside >> >> and outside observer while keeping in mind the >> >> Einstein postulates? Thanks >> >> > Yes. Inside the ship it moves straight north >> > south. >> >> Nope .. not from the description given. There >> will be aberration. > > From the description given (other than what he means by > "longitudinal"), the light enters on either north or south face, and > proceeds to exit on south or north face. But not directly across from where it enters, according to an observer in the ship. So not directly north to south. > What room for "aberration" > do you see for an observer that is inside the ship for the entire > event? The width of the ship gives you plenty of room .. it is 30,000,000 km wide >> > Outside the ship >> > (at rest), it moves along with the ship... >> > and north and south. >> >> Outside the ship it moves the same as inside >> the ship, from the same observers point of view. > > It isn't clear what motion his outside observer has wrt the ship. I am assuming it is the observer who sees the ship as moving at 0.9c nad contracted to 10m in length > Perhaps the ship's length is contracted to 10m for this person. That seems to be what it says > The > setup is unclear. > >> > And here I thought you were going to start this joke... >> >http://www.supercubs.org/phpbb2/viewtopic.php?t=4958 >> >> Not a very funny joke, if it was meant as one at all. > > It is. And an old one too. I managed to find one version that did > not disparage one ethnicity. > >> Unless I missed something humorous in it. > > He landed sideways on the runway. The runway is very short, but it > sure is wide... > > David A. Smith |