Calculate Average Power: 60kg Woman Running Up 4m Stairs in 6s

[wakejosh]

not sure how to solve this, having trouble finding the equation I need in my book. any help is appreciated. thanks in advance.

A 60 kg woman runs up a flight of stairs having a rise of 4.0 m in
a time of 6.0 s. What
average power did she supply?

 

[geoffjb]

not sure how to solve this, having trouble finding the equation I need in my book. any help is appreciated. thanks in advance.

A 60 kg woman runs up a flight of stairs having a rise of 4.0 m in
a time of 6.0 s. What
average power did she supply?

Find the equation for power, and work back from that.

 

[wakejosh]

and another one:

A horizontal force of 100 N is applied to move a 45 kg cart across
a 9.0 m level surface.
What amount of work is done by the 100 N force?


now with this one do I just do 100 N * 9.0 M = 900 J ? is this correct?

 

[wakejosh]

Find the equation for power, and work back from that.

60kg * 9.8 m/s/s = 588 N
ok so 588 N * 4 m = 5352 J

2352/6 s = 392 Watts

pretty sure that's it. am i right?

 

[radou]

60kg * 9.8 m/s/s = 588 N
ok so 588 N * 4 m = 5352 J

2352/6 s = 392 Watts

pretty sure that's it. am i right?

You're right, except for mixing up the numbers. 588*4 = 2352.

 

[wakejosh]

yea.. that was a typo. thanks.