Work done (joules) and time taken (seconds) is the information needed to calculate power in watts (joules/second).
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9 to the 2 power is 81 9x9=81 When you are calculating powers you are really multiplying the first number by itself the number of times the second number says. so for 9 to the 2 power you are multiplying 9 by itself 2 times
7.5 watts
Approximately 0.01341 horsepower or 0.01 kilowatts.
The answer depends on the mass of the piano and the height of the floor.
Well, darling, the square root of x to the 8th power is x to the 4th power. It's like cutting a cake into 8 equal pieces and then taking the square root to get 4 pieces. Simple math, just like how I like my martinis – straight to the point.