Asked by Andy Blackwell Uncategorized
How fast does A rocket come down to earth?
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How does a rocket go in space?
a rocket goes into space really fast because gravity will pull it down otherwise so it has to get rid of the gravitational pull by travelling really fast. If the question is about propulsion, then Newton's third law comes into effect. By "throwing" gases out the back really fast, the rocket is pushed in the other direction. The more gas we throw and the faster we throw it, the faster we go.
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Why does a rocket have to go fast to put a satellite into orbit?
A rocket that is leaving the earth needs to travel at high speed to leave the earths gravity. The speed needed is approx 40,000km/h to break free from earths gravitational pull. An easy way to imagine this is if you pick up a tennis ball and throw it as fast as you can (eg, 90km/h) the tennis ball will travel up into the sky then will be pulled back down to the earth. Now you can throw the tennis ball at 20,000km/h. The ball would travel approx half way around the globe before being pulled back down to the earth. Now imagine you can throw the ball at 40,000km/h. The ball would leave the earth then travel around the earth in orbit.
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