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Which describes the force on a satellite keeping it in a circular orbit around the earth?
An object in orbit is in what is known as "free-fall". The best way to understand this is to realise that the object has 2 motions: down, and sideways.An object 1000 miles high in orbit will fall down towards the centre of the earth exactly 1000 miles. BUT, in the time it takes it to fall that 1000 miles, it moves EXACTLY 1000 miles sideways, so it is still exactly 1000 miles above the earth. It then falls exactly 1000 miles towards the centre of the earth, but in that time, moves another 1000 miles sideways, so it's STILL 1000 miles above the earth.Now, change that 1000 miles down, for 10 miles, or 1 mile, or 1 inch, AND, change the 1000 miles sideways for 10 miles, 1 mile, 1 inch.The concept of a stable orbit is that for each unit the object moves DOWN, it moves sideways far enough that it is still exactly the same height above the centre of what it is orbiting.
How much does something weigh 1000 meters above earths surface?
"at an altitude of 400 kilometres (250 miles), equivalent to a typical orbit of the Space Shuttle, gravity is still nearly 90% as strong as at the Earth's surface" -- Wikipedia: Earth's gravity # Altitude
How long is the biggest sunflower?
12 meters
Is it true that two otherwise identical objects have temperatures of 1000 K and 1200 K respectively The object at 1200 K emits roughly twice as much radiation as the object at 1000 K?
Yes, more or less. The power radiated is proportional to the 4th. power of theabsolute temperature; 1200 is 1.2 times as much as 1000, and 1.2 to the fourthpower is a bit more than 2.But the emitted radiation comparison is per unit of surface area, not for the whole object.
Is 1 meter less than 270 kilometers?
To compare two measurements, please convert both to the same unit. In this case, you can convert kilometers to meters by multiplying the number of kilometers by 1000. Or the other way round: convert meters to kilometers, dividing by 1000. The answer to the question is 269 kilometres and 99 metres.
