for my parachute i decided to make a pillow with string at the bottom for the weight.
i made a prototype for the pillow and tested it but was not happy so i remade it with the bottom half of a garbage bag instead of the top and inflated it with more air. i then tested the weight and was sastisfied with the results. i then kept it ready for the test day. on the test day i added more air as it had lost most of it and got ready. when i dropped it it took about 4.5 sec to make it to the bottom.
the pillow was big which slowed its velocity and because it was filled with air it slowed down even more. to transport a heavier object i would need to add pillows and tape them together to prevent air from seeping between them.
Wednesday, April 22, 2015
car safety for dodge challenger 2015
the 2015 dodge challenger is made with mostly steel, plastic, aluminum and rubber.
Advanced Multistage Front Airbags, Supplemental Front Seat-Mounted Side Airbags, Supplemental Side-Curtain Front and Rear Airbags and Active Head Restraints are standard on all models.
Electronic Stability Control, Hill Start Assist are standard on all models.
ParkSense® Rear Park Assist System and ParkView™ Rear Back-Up Camera are standard on most.
Technology Group is optional on most.
Tuesday, April 14, 2015
paper airplane
was 6.2 sec and distance was 11.2 m
Monday, April 13, 2015
future of trasportation
http://www.citylab.com/tech/2014/09/honolulu-is-building-americas-first-fully-driverless-transit-system/380292/
in Hawaii many people don't think of traffic jams but in a city of over 1 million it is very common. It is rated as one of the worst in the US. For example one who flies in and wants to get downtown has to drive in a 7 lane highway going there and in rush hour it is bad. The Honolulu Authority for Rapid Transportation (HART) is now trying to change this by creating a fully automatic 20 mile elevated rail line. It will get people into the city in a fraction of the time to drive and will be fully automatic from opening doors to being driverless. The first trips are planned for 2017. It is planned to reduce congestion by 18% and take up to 40000 cars off the road and replacing them with a fleet of four car trains that can accommodate up to 800 riders, with racks for both bicycles and surfboards. This will also be the first fully automated wide scale transit system in the US.
in Hawaii many people don't think of traffic jams but in a city of over 1 million it is very common. It is rated as one of the worst in the US. For example one who flies in and wants to get downtown has to drive in a 7 lane highway going there and in rush hour it is bad. The Honolulu Authority for Rapid Transportation (HART) is now trying to change this by creating a fully automatic 20 mile elevated rail line. It will get people into the city in a fraction of the time to drive and will be fully automatic from opening doors to being driverless. The first trips are planned for 2017. It is planned to reduce congestion by 18% and take up to 40000 cars off the road and replacing them with a fleet of four car trains that can accommodate up to 800 riders, with racks for both bicycles and surfboards. This will also be the first fully automated wide scale transit system in the US.
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