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Answer to Question #88688 in Mechanics | Relativity for emaan
Question #88688
A builder lifts eight slabs from the ground on to the back of a lorry 1.5 m high.
The total time taken is 48 s and each slab weighs 200 N.
How much useful power does the builder produce?
The total time taken is 48 s and each slab weighs 200 N.
How much useful power does the builder produce?
Expert's answer
The power by definition
"P=\\frac{\\rm{work\\:done}}{\\rm{time}}=\\frac{mgh}{t}""=\\frac{8\\times 200\\:\\rm{N}\\times 1.5\\:\\rm{m}}{48\\:\\rm{s}}=50\\:\\rm{W}"
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