1) Why do rivers and springs flow? 2) Are the bodies inside the spacecraft in space?
3) What about the weight of an athlete jumping from a height?
4) What time can be measured inside an artificial satellite?
A) Hourglass
B) Satellite clock
B) The hourglass
5) Is it possible to light a candle in a state of weightlessness?
6) Is it possible to swim in a spaceship by diving into the water?
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