a man of mass 50kg ascends a flight of stairs 5m high in 5seconds .if the acceleration due to gravity is10m/s,the power expended is
power = work/time
work = force * distance
force = mass * acceleration
so, the power expended is
50 kg * 10 m/s^2 * 5m / 5s = 500W
Correct
ajibade
Thanks u
To find the power expended by the man while ascending the stairs, we first need to calculate the work done and then divide it by the time taken.
The work done can be calculated using the formula:
work = force × distance
In this case, the force is equal to the weight of the man, which can be calculated using the formula:
force = mass × acceleration due to gravity
Plugging in the values given:
force = 50 kg × 10 m/s²
force = 500 N
Now, we can calculate the work done by multiplying the force by the distance:
work = 500 N × 5 m
work = 2500 J (joules)
Next, we divide the work done by the time taken to get the power expended:
power = work / time
Plugging in the values given:
power = 2500 J / 5 s
power = 500 W (watts)
Therefore, the power expended by the man while ascending the stairs is 500 watts.