A man has power of 90W and mass 60kg runs up a staircase in 40 second. If each step of staircase is 20m high calculate the number of steps
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power P=90w
time t=40s
mass m =60kg
height of the step h=20m
let n be the number of steps
work done to run. number of steps = nmgh
therefore, power P= work done to run n steps
/time taken
90=mghn/time
90=60x9.8x20n/40
n11760/40=90
294n=90
n=0.306 steps
time t=40s
mass m =60kg
height of the step h=20m
let n be the number of steps
work done to run. number of steps = nmgh
therefore, power P= work done to run n steps
/time taken
90=mghn/time
90=60x9.8x20n/40
n11760/40=90
294n=90
n=0.306 steps
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