question_answer

A man of mass 60 kg runs up a flight of 3 0 steps of each 20 cm hight in 40 sees (a) What is work done by the man (b) What is power of the man (c) Express the power of the man in horse power

Answer:

(a) \[W=F\times S=mgh=60\times 10\times 6=36000\,\,J\] [since\[h=30\times 20=600\,\,cm=6cm\]] (b) \[P=\frac{w}{t}=\frac{36000}{40}=90\,w\] (c) 1HP = 746 watt ? - 90 watt \[P=\frac{90\times 1}{746}=0.1206\,\,hp\]