bicycle helmets price image
Mariella M
You work for a company that makes helmets: motorcycle helmets, bicycle helmets, baseball and football helmets. When choosing materials to make these helmets, what physical properties would you look for? explain
Answer
Durability: the material may be impacted by another object with greater
hardness, but sustain little or no permanent damage to its own structure.
Hardness: the material needs to have a hardness that is as great as
possible so that it will be protective to the wearer when impacted.
Resiliance: the material needs to be able to absorb an impact with
some degree of deformation, but return to its original shape when the
impact force has been removed. This absorbtion of energy is critical,
because one does not want the impact force to be transferred to the
wearer. The idea is to sacrifice damage to the helmet material, and have
it absorb the energy of impact, rather than have that energy passed on
to the wearers head.
Light weight: the material should be as light as possible for comfort to the wearer.
Easily shaped: the materials need to be easily formed by standard manufacturing methods, so that it may be built efficiently and for the
lowest price. Efficient methods include processes like hot-melt molding,
blow-forming, and machining.
Low cost: the basic materials need to be as low cost as possible to make
the finished product affordable and competitive with similar products on
the market.
Durability: the material may be impacted by another object with greater
hardness, but sustain little or no permanent damage to its own structure.
Hardness: the material needs to have a hardness that is as great as
possible so that it will be protective to the wearer when impacted.
Resiliance: the material needs to be able to absorb an impact with
some degree of deformation, but return to its original shape when the
impact force has been removed. This absorbtion of energy is critical,
because one does not want the impact force to be transferred to the
wearer. The idea is to sacrifice damage to the helmet material, and have
it absorb the energy of impact, rather than have that energy passed on
to the wearers head.
Light weight: the material should be as light as possible for comfort to the wearer.
Easily shaped: the materials need to be easily formed by standard manufacturing methods, so that it may be built efficiently and for the
lowest price. Efficient methods include processes like hot-melt molding,
blow-forming, and machining.
Low cost: the basic materials need to be as low cost as possible to make
the finished product affordable and competitive with similar products on
the market.
How much would a good price be for a new moped? What about a good used one?
Phoenix Lu
Also, what kind of moped would you recommend I buy? I'm not in the market for one now, but in several years, I plan on purchasing one, and I'm curious about what a good price would be, so I don't get cheated. Any info you could give would be helpful.
Also, how does one keep a moped secure? How practical are they for travel? I won't buy one until I live in a city, perhaps overseas.
By the way, I do value my life, and I have a car.
Answer
A typical price range is 1,100-3,000 depending on the seller. Merchants have large markups, though, so buying onlne and having it delivered (often FREE!) us not a bad idea.
A 49 cc doesnt require a motorcycle license (here in FL) and there isn't a requirement for insurance for any size engine. Of course, you can do what i did and take a safety course anyway and get a motorcycle endorsement for you own good and peace of mind.
I recommend Vento or Vespa. These are by far the better made and longer lasting, and shopworker dont 'cringe' when you mention their name like they do when you say 'Quinqi' or Verucci....
Yes, theyre ALL made in China/Japan/Beijing/Hong Kong/Bangladesh with the exception of Vespa-- Vento is ASSEMBLED in the US tho the parts come from China, however- it's WAYYY better made than the rest.
I keep mine secure by parking it in my yard, by my bedroom window, tied to a BIG ENOUGH tree with 11 feet of 3 inch link steel chain (and something like 3/4" width). It's the highest strength and size chain that home depot sells! AND, I use the biggest lock I can buy. The lock itself is about 15 dollars.
I loop the chain around the tree, and through either the chassy of the motor (underbelly of the bike) or around the middle of the bike (where you put your feet to ride) without enough slack to pull the bike out. When I take it out, I have a smaller chain to take with me under the seat, which I loop around the middle of the bike and through the wheel of the fornt tire. Plus, my new bike has an alarm, too, so I turn it on. If I'm home, I usually dont to spare the battery becuase I can hear whats going on outside. Often, you can park the scooter in a bike rack and loop the chain through that. Depends on the place.
They are incerdibly practical for travel, consideirg you buy above 49cc-- that means you get 40+ miles per hour, up to 60-65 mph. And it's a strong enough ride, to keep up with traffic, and merge when necessary (forget merging with a 49cc!! You're stuck where you are around 35 mph!)
I buy a crate, a plastic organization crate with slots, and attach it to the back of the bike with bungees. Its more stoagre than the typical trunks that supply you with (if at all). I also buy a medium (15x15") cargo net to keep thing inside the crate when I go over bumps! That's ~7$ on amazon.com just type in cargo net and pick that size.
The only weakness I can think of is being in the sun/heat more than in a car. I am in FL, and I suffer sometimes if I ahev to travel in broad sunlight- cover up witha light jacket. Always wear a helmet- get a tinted visor if you can or just wear sunglesses underneath.
Also groceries- there is little space and also it is not kept in an air conditioned trunk like in a car. That's okay, though, if you make short trips or just goa bit more often and buy little at a time. Works just fine. (Esp if your going overseas, its actually normal to buy only what you can carry or bicycle back home)
BUY INSURANCE, even tho it isnt needed- people DO try to steal them or will if they can, also, if someone hits you or the bike, you are covered.
I own both a Quinqi 49cc (1,200$) and a Vento 150cc (2,400$ at a discount to me). I love both bikes. I REALLY love my VENTO!!! An average week of about ~55 miles travel, I have to buy gas once or twice at 2$ or 3$ per purchase. I have 1.6 gallon tank on the quinqi and 2.2 gallons on the Vento.
....errrr.... any more questions... ask me!
Oh and I love to decorate by basket with reflectors, or, the bike itself I apply reflective pinstripting/decals liek you get at streetglo.net or similar shops, it comes in any size or color or design (even a custom design and size) and you can put it anywhere you like. It blends in during the day, and when a light shines on it at night, it's like a fireman's coat or the reflectors on the street! Really glows! It's cool and it's a good safety measure! You can do your helmet that way too!
Cheers and happy moped-hunting, and enjoy the ride!!
A typical price range is 1,100-3,000 depending on the seller. Merchants have large markups, though, so buying onlne and having it delivered (often FREE!) us not a bad idea.
A 49 cc doesnt require a motorcycle license (here in FL) and there isn't a requirement for insurance for any size engine. Of course, you can do what i did and take a safety course anyway and get a motorcycle endorsement for you own good and peace of mind.
I recommend Vento or Vespa. These are by far the better made and longer lasting, and shopworker dont 'cringe' when you mention their name like they do when you say 'Quinqi' or Verucci....
Yes, theyre ALL made in China/Japan/Beijing/Hong Kong/Bangladesh with the exception of Vespa-- Vento is ASSEMBLED in the US tho the parts come from China, however- it's WAYYY better made than the rest.
I keep mine secure by parking it in my yard, by my bedroom window, tied to a BIG ENOUGH tree with 11 feet of 3 inch link steel chain (and something like 3/4" width). It's the highest strength and size chain that home depot sells! AND, I use the biggest lock I can buy. The lock itself is about 15 dollars.
I loop the chain around the tree, and through either the chassy of the motor (underbelly of the bike) or around the middle of the bike (where you put your feet to ride) without enough slack to pull the bike out. When I take it out, I have a smaller chain to take with me under the seat, which I loop around the middle of the bike and through the wheel of the fornt tire. Plus, my new bike has an alarm, too, so I turn it on. If I'm home, I usually dont to spare the battery becuase I can hear whats going on outside. Often, you can park the scooter in a bike rack and loop the chain through that. Depends on the place.
They are incerdibly practical for travel, consideirg you buy above 49cc-- that means you get 40+ miles per hour, up to 60-65 mph. And it's a strong enough ride, to keep up with traffic, and merge when necessary (forget merging with a 49cc!! You're stuck where you are around 35 mph!)
I buy a crate, a plastic organization crate with slots, and attach it to the back of the bike with bungees. Its more stoagre than the typical trunks that supply you with (if at all). I also buy a medium (15x15") cargo net to keep thing inside the crate when I go over bumps! That's ~7$ on amazon.com just type in cargo net and pick that size.
The only weakness I can think of is being in the sun/heat more than in a car. I am in FL, and I suffer sometimes if I ahev to travel in broad sunlight- cover up witha light jacket. Always wear a helmet- get a tinted visor if you can or just wear sunglesses underneath.
Also groceries- there is little space and also it is not kept in an air conditioned trunk like in a car. That's okay, though, if you make short trips or just goa bit more often and buy little at a time. Works just fine. (Esp if your going overseas, its actually normal to buy only what you can carry or bicycle back home)
BUY INSURANCE, even tho it isnt needed- people DO try to steal them or will if they can, also, if someone hits you or the bike, you are covered.
I own both a Quinqi 49cc (1,200$) and a Vento 150cc (2,400$ at a discount to me). I love both bikes. I REALLY love my VENTO!!! An average week of about ~55 miles travel, I have to buy gas once or twice at 2$ or 3$ per purchase. I have 1.6 gallon tank on the quinqi and 2.2 gallons on the Vento.
....errrr.... any more questions... ask me!
Oh and I love to decorate by basket with reflectors, or, the bike itself I apply reflective pinstripting/decals liek you get at streetglo.net or similar shops, it comes in any size or color or design (even a custom design and size) and you can put it anywhere you like. It blends in during the day, and when a light shines on it at night, it's like a fireman's coat or the reflectors on the street! Really glows! It's cool and it's a good safety measure! You can do your helmet that way too!
Cheers and happy moped-hunting, and enjoy the ride!!
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Title Post: When choosing materials to make helmets, what physical properties would you look for?
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