A robot is a machinethat does tasks without the help of a person. Many people think of robots as machines that look and act like people. Most robots, though, do not look like people. And robots do only what a person has built them to do.
Most robots are computer-controlled devices with many parts. An industrial robot, for example, is an armlike machine that can turn at several joints. It has a handlike part to grasp and hold things. Motors move the parts.
Some robots can be “taught” to do a job. For example, a person might guide an industrial robot through the movements needed to do something. Sensors on the robot send signals about the movements to the computer. The computer stores the pattern of movements. Later the computer can retrieve the pattern and tell the robot what to do.
Most industrial robots are used in factories. Some robots load, move, and unload materials. Others are used on assembly lines to help build things such as cars and appliances.
Robots are especially useful because they can do things that could be dangerous for people. For example, they can be sent deep underwater or into space. Robots can also handle dangerous materials such as radioactive waste or harmful chemicals. They can even dispose of bombs or do spy work for the military
I've already voted in my favorite dinosaur, but I was hoping I would be allowed to post why I think T-rex is so popular. While we now know it wasn't the biggest carnivorous dinosaur, for decades it has held that title, and a newly discovered specimen might just win it back. It has a great name ("tyrant lizard king") and is one of the few dinos with a "nickname". Giganotosauruus and Carcharodontosaurus are awfully long. Also, it lived in North America, and literally once roamed our backyards (at least in the case of USA and CAN). More scientific reasons it SHOULD be popular are that it was more closely related to birds than the carnosaurs, was more likely to have had feathers or proto-feathers at some point in its life, and, judging by its affinities with the troodonts and the ostrich dinos, was probably much faster and smarter than the more primitive carnosaurs. Also, I'll admit, it's better known, but if someone wants to try and change that they should write a book featuring another dinosaur. (As was the case of Velociraptor.) Being old school, though, I'm glad to see the classics haven't died.
Diplodocus) is a huge dinosaur eat plants belongs to sauropodomorpha lived in the Jurassic era in North America about 150 million years ago, with a length of 26 meters, and weighs 10,000 kg.
He has known this giant dinosaur that longer Danassourakchw yet. It had a very long neck and tail too long and was rear legs longer than the front legs. Scientists have confirmed that Dablodjelkos was pushing trees Bsakana front based on their hind legs and signed to the ground and then eat the leaves from the ground. But he has small teeth, a very small head and this is what has surprised scientists, where they expected it eats on Bstmrar to keep this giant alive, has Dablodjelkos used its tail deadly and powerful weapon, and some scientists have confirmed that the swing tail speed faster than sound.
Teen is the age between 11-21,which are difficult years ,
Many challenges and problems may happen for a teenager ,they become nervous,rebellion,moody,and shame and also this age is difficult for parents to deal with their kids .Because some of them can be disobedient , and they can become closer to others than their parents.
,complaining from families with teenagers are common,for example
parents complain from the lack of help from teens in the house
.or not listening to their advices ,their friends ,the strange style of them,and that they don't study enough On the other hand,teens say that the parents do not respect them and that they became grownups
and they always complain about their friends .
At the end parents must try to understand their teens and gives them some privacy, after all its a temporary stage that will pass .
Nowadays, teenagers have changed in comparison with the teens in the past, taking into account eating habits, an active way of life, spending free time and clothes. They are a “technology” generation. For teens in todays’ world mobile phones, internet, music, movies, television and video games are very important. Most teenagers prefer watching TV and playing computer games to reading books. They don’t like reading because watching TV is easier and they don’t have to use their own imagination. Computer games teach but they are also harmful to health. Teenagers prefer to spend free time in front of a computer rather than to walk, play football or go to a swimming pool. Moreover, games transfer them into the world which doesn’t exist. It is very exciting for the youth. They meet with friends in such places as McDonalds. Teens eat there unhealthy food. They eat too much fast food.
تاريخ آخر تحديث: الإثنين, 20 آذار/مارس 2017 15:42