This stop-motion video shows 297 frames from the Mars Descent Imager
aboard NASA's Curiosity rover as it descended to the surface of Mars.
These thumbnail images were received on Earth on Aug. 6, 2012, and cover
the last two and a half minutes of descent.
Blog de Tecnología de la ESO y Bachillerato. Bilingüe. Diseño. Vídeos. Tutoriales. Autor: José Manuel Diez Moronta (Techno Know How)
martes, 7 de agosto de 2012
sábado, 9 de junio de 2012
lunes, 7 de mayo de 2012
Mecánica básica
Página web multimedia, destinada al primer ciclo de ESO, con alto grado de interactividad debido al uso de applets
de Java que simulan en tiempo real el funcionamiento de los diferentes
mecanismos básicos basados en las variables de entrada introducidas por
el usuario.
MecanESO
Página web relacionada con los contenidos de Mecánica vistos en primer
ciclo de ESO. Divide los contenidos en seis apartados: máquinas,
operadores, mecanismos, organización, ejercicios e imprenta.
domingo, 6 de mayo de 2012
domingo, 25 de marzo de 2012
Paper Bridge World Record - 1071 lbs (485.79 Kg)
Paper Bridge World Record
For part of the physics curriculum at Plano West, the students had to
build bridges out of nothing but paper, tape, and glue. This bridge held
1,071 lbs (485.79 Kg) after initially breaking the hook that held the weights at
800 lbs the day before.
Details of the bridge:
There are 6 compression members, each made of 7 sheets of paper;
One V-shaped tension structure made of 20 sheets paper, layered and glued so that it would remain tight and flat;
The base is made of 20 sheets paper, including the roadway;
The loading zone and corner enforcements made of cut rolled members of 4 sheets thick;
The paper nails used to pin all the joints total to about 1.5 sheets;
One pack of J-B Weld glue (for all joints), used about 60%;
A four-pack of super glue (for paper nails and final touches);
One quart of wallpaper glue, used about 20% of it;
In total, it amounted to about 90 sheets of paper, with a final weight of 493 grams.
Details of the bridge:
There are 6 compression members, each made of 7 sheets of paper;
One V-shaped tension structure made of 20 sheets paper, layered and glued so that it would remain tight and flat;
The base is made of 20 sheets paper, including the roadway;
The loading zone and corner enforcements made of cut rolled members of 4 sheets thick;
The paper nails used to pin all the joints total to about 1.5 sheets;
One pack of J-B Weld glue (for all joints), used about 60%;
A four-pack of super glue (for paper nails and final touches);
One quart of wallpaper glue, used about 20% of it;
In total, it amounted to about 90 sheets of paper, with a final weight of 493 grams.
The bridge broke on one of the compression members, but all of the joints are still intact.
The hole in the loading zone is off center a bit, stressing that one compression member more than the others.
It could improve a few hundred pounds if changes were made:
The loading hole is drilled better in the center.
all four side members have 2 more sheets of paper (the two top members remain same) while the V-shaped tension structure & the base could be reduced by 4 sheets paper each.
The hole in the loading zone is off center a bit, stressing that one compression member more than the others.
It could improve a few hundred pounds if changes were made:
The loading hole is drilled better in the center.
all four side members have 2 more sheets of paper (the two top members remain same) while the V-shaped tension structure & the base could be reduced by 4 sheets paper each.
Proyecto: Estructuras. Puentes de papel
Diseña y construye un puente que cumpla las siguientes especificaciones:
Material: papel y cola blanca.
Distancia entre pilares (luz): 40 cm
Superficie sobre pilares: 10 cm (máx)
Carga mínima a soportar en el centro del puente : 2 kg
Superficie de rodaje (tablero): 30 cm
Se usará la menor cantidad posible de material.
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