>>1)What are the main purposes that they pace shuttle was built??i mean after they landed on the moon what was NASAS's next step with the space shuttle?<<
The space shuttle was originally to be a ferry to low Earth orbit. It would carry components of interplanetary spacecraft that wouild be assembled in orbit and used by large crews to travel to the Moon, mars or even further. It would deliver parts, supplies and crews to an orbiting permanenet space station. It would place large satellites in orbit and would be used to retrieve or repair existing satellites. It was to have been the main transport from Earth to a staging post that led to the rest of the solar system.
And then the budget got slashed and most of the things the shuttle was designed to support were cancelled.
>>2)There is inside the Space shuttle any room for science experiments?except for the place to sleep and toilet.<<
Plenty. Inside the payload bay there is room for a module called Spacelab, which has only one purpose: the conducting of scientific experiments in orbit.
>>3)From the time that te space shuttle is launch how much time need to get in orbit??i know that the ET is separate around 8 minutes.how much time after that??<<
It takes about 11 minutes in total to get from the ground to a stable orbital altitude.
>>4)I also read in the web that when its separated from the SRB the shuttle travel with a speed of 2500 kph.. The orbiter operates at 200 miles to 400 miles..If you travel with 2500 kph you just need seconds to reach that attitude. How i takes so much to reach in orbit??if you watch videos in youtube last for 11 minutes till the shuttle get in orbit.<<
The shuttle isn't going straight up, and it must reach 17,500 mph if it is not to come back down again too soon. That's why it takes so much longer. Nothing in space flight involves straight lines or constant velocities, so attempting to use them to calculate how long something shouyld take is the wrong approach.
>>The same thing with the re-entry?<<
With re-entry the shuttle only slows down a little so that it drops down to an altitude at which it starts to encounter friction from the atmosphere. It is that friction that slows it down still further and causes it to drop down to a gliding landing on the ground.
>>5)The shuttle to reach ISS need 1 or 2 day in orbit.how that happen??if you are in orbit closer to earth you travel faster?<<
It could do it much faster. Rendezvous in space is a well practised activity. On one of the Gemini flights they managed to launch a Gemini spacecraft in a 2 second launch window and rendezvous with a target vehicle already in orbit within an hour. However, that requires a great deal of precision and a lot of fuel if you get it even slightly wrong. The most fuel efficient way to do it is to launch and then make a number of minor adjustments untiul you make the rendezvous. This also gives the crew time to check out the systems once the space shuttle is in orbit and make any preparations or checks prior to committing to the rendezvous.