Question

in 1984 don, disk that stayed aloft for 16.7 seonds supsuppose cain ran up a staricase during this time, reachig a height of 18.4 m if his mass was 72 kg how much powerwas needed for his ascent

Answer 1

given,

time of disk stayed a loft = 16.7 sec

height reached = 18.4 m

mass = 72 kg

now work done is equal to change in potential energy

`W = - (U_f - U_i)`

`W = - (mgh - 0)`

`W = - (72* (-9.8) * 18.4)`

W = 12983.04 J

Positive sign means that work is in the direction of motion.

`Power = (Work\ done)/(time)`

`Power = (W)/(t)`

`Power = (12983.04)/(16.7)`

P = 777.42 Watts