Determine the power of the coffee grinder if it does 5.4kJ of work in 30 seconds.

These tasks: t (duration of the coffee grinder) = 30 s; A (perfect work of the grinder) = 5.4 kJ (5400 J).

The power of the considered coffee grinder is determined by the formula: N = A / t.

Let’s calculate: N = 5400/30 = 180 W.

Answer:  The considered coffee grinder has a power of 180 watts.

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