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Suppose you want a glass of 50 degree C water, but all you have is a hot tap and a cold tap that produce typical streams of water at 98 and 2 degree C respectively. So you fill the glass halfway with...

I suspect these are related:

1. Please characterize the effort that a helicopter expends to hover in place. Work is force dotted with distance, but distance here is 0, so it seems the usual...