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At an altitude of 220 km, the downward force of gravity on an Earth satellite is
a little bit weaker
When an astronaut in space sneezes, his head is snapped back with higher velocity on Earth, because
Wrong! His head is not snapped back with higher velocity
The method that would take the least energy to get something to space is
lifting it by an elevator (f the elevator existed)
If an artificial satellite orbited the Earth at 240,000 miles (the distance to the Moon), it would orbit the Earth in a period of
The force of gravity between two people standing next to each other is
small but measurable (flea/10^-7)
Ice-skaters spin faster by pulling in their arms. This illustrates that
angular momentum is conserved
The Sun is mostly hydrogen, yet the Earth has very little hydrogen gas. That's because
it escaped to space
Compared to the weight of the payload, the fuel used in a rocket to orbit typically weighs
over 20 times more
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