/u/the_y_of_the_tiger's posts in /r/askscience

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What are the limits of gravitational slingshot acceleration?

4762 upvotes

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If there's no such thing as a perpetual motion machine, what keeps electrons constantly on the move and what causes light to "speed back up" when it moves through air and then water and then back into air?

285 upvotes

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When it is crazy cold in the U.S. does that mean that the globe is likely colder overall at the moment, or is the distribution of cold and warm on the planet just distributed differently?

162 upvotes

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What did Elon Musk mean when he said the Falcon 9 rocket crashed because it "ran out of hydraulic fluid"? Isn't a hydraulic system closed? How would it run out?

11 upvotes

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Is it possible that we could ever generate electricity from the momentum being carried in falling raindrops - by capturing the force with which they land on a rooftop panel?

8 upvotes

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Are there any technologies on the horizon to fight tornado formation, or to disperse them once they form?

1 upvotes

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When I open the window shade in the morning, how many photons stream in per second? Are we talking million, billions, trillions, or more?

1 upvotes

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How feasible would it be to build a balloon or blimp-type vehicle that could ascend high enough that the earth would turn below it and the vehicle could then come straight down and be on the other side of a big country or continent?

1 upvotes

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When the rain stops in Houston, how much of it will drain into a body of water and how much of it will leave only when it evaporates? How long will it all take?

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How much faster could someone run in a vacuum?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What are the limits of gravitational slingshot acceleration?	4762
If there's no such thing as a perpetual motion machine, what keeps electrons constantly on the move and what causes light to "speed back up" when it moves through air and then water and then back into air?	285
When it is crazy cold in the U.S. does that mean that the globe is likely colder overall at the moment, or is the distribution of cold and warm on the planet just distributed differently?	162
What did Elon Musk mean when he said the Falcon 9 rocket crashed because it "ran out of hydraulic fluid"? Isn't a hydraulic system closed? How would it run out?	11
Is it possible that we could ever generate electricity from the momentum being carried in falling raindrops - by capturing the force with which they land on a rooftop panel?	8
Are there any technologies on the horizon to fight tornado formation, or to disperse them once they form?	1
When I open the window shade in the morning, how many photons stream in per second? Are we talking million, billions, trillions, or more?	1
How feasible would it be to build a balloon or blimp-type vehicle that could ascend high enough that the earth would turn below it and the vehicle could then come straight down and be on the other side of a big country or continent?	1
When the rain stops in Houston, how much of it will drain into a body of water and how much of it will leave only when it evaporates? How long will it all take?	1
How much faster could someone run in a vacuum?	1