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Question:

What is te answer to this HARD physics question in s ?

A 3.20 102-kg piano is being lifted at a steady speed from ground level straight up to an apartment 16.0 m above the groundThe crane that is doing the lifting produces a steady power of 4.00 102 WHow much time does it take to lift the piano?

Answer:

the atoms or communities of atoms do no longer in uncomplicated terms 'spontaneously' grow to be charged they take electrons from or provide electrons to different atoms or communities of atoms it takes 2 to tango as Ca + S - CaS Ca and S start up out independent yet Ca supplies 2 e- to S and that they grow to be Ca+2 and S- 2 in the compound CaS
Since Power energy/time we have time energy/powerThe energy here is the potential energy mgy So t mgy/P 3.20x10^2kg9.8m/s^216.0m/4.00x10^2W 125 s

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