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Some machines hurt people when they are sopose to help them?
true but machines hurt people when people dont use machines properly
Why does factories use so many machines?
They use machines so people don't have to work as hard.
Two reasons why people use simple machines?
The two reasons why people use simple machines are because they make things easier to pull and lift.
Who invented the roller ball bearing?
It is not known who specifically invented the roller ball bearing. There are examples of their use by the ancient Egyptians. However, it is thought that they may have been invented before the wheel.
What did Alfred Nobel use to improve dynamite?
he invented them he didn't improve them,before there was something else(sorry i have forgot the name) but he was the 1 who invented dynamites.
Related Questions
What did people use before motorcycles invented?
bikes
What did people use before the zipper was invented?
Buttons.
What did people use before couches were invented?
benches
What did people use before dynamite was invented?
pickaxes
What did people use for transportation before use cars was invented?
carriages
What did people use before vehicle were invented?
horses or their feet.
What did people use before backpacks were invented?
Brief case
What did people use before the battery was invented?
wall sockets
What did people use before the ATM was invented?
We used letters.
What did people use before a typewriter was invented?
A pen and paper!
How did people travell before cars were invented?
they use to walk
What do people use before window screens were invented?
Fingernails!!
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