Question

Milton has a mass of 80kg. It takes him 30 seconds to climb a 5m staircase. a)what is his weight. b) what is the work done when he climbs the stairs. c) what is his average power output. d) Why, in reality, will he have to do more work than you have calculated?

Answer 1

Answer:

Given,

Time, t=15sec

height of each stair, s=0.2m

Displacement, d=N×s=25×0.2=5m

Total weight, W=(man mass+load mass)g=(80+25)×9.8=1029N

Power,P=

total time

change in potential energy

P= change in potential energy

P=

t

Wh

=

15

1029×5

=343 W

t

Wh

=

15

1029×5

=343 W

Power is 343W

Answer 2

Answer:

Answer:

Given,

Time, t=15sec

height of each stair, s=0.2m

Displacement, d=N×s=25×0.2=5m

Total weight, W=(man mass+load mass)g=(80+25)×9.8=1029N

Power,P=

total time

change in potential energy

P= change in potential energy

P=

t

Wh

=

15

1029×5

=343 W

t

Wh

=

15

1029×5

=343 W

Power is 343W