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How about a yo-yo? Or a powerball? |
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They're ok, but the 'rang' of boomerang is hard to resist
when it comes to phones, plus I like the idea of using a
20,000 year old technology as an emergency solution to a
21st century device. |
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Wait. If you're converting the rotational kinetic energy into electrical energy, then there's not enough boom left in your rang ... so, basically, you're just throwing a stick. |
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This is fine, provided that your dog will bring it back. In that case, though, you'd do better to charge your phone from the piezoelectric crystals in the handle of your extensible dog leash. |
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"Ooh, is that a wood pigeon?" might get you 100 Newtons sustained for, say, 5 seconds, before he realizes there's no wood pigeon. Is that really 10kj before conversion losses? That seems rather high. |
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