Lisa runs up 4 flights of stairs in 22. seconds. She weighs 510. ...

[sc00by25]

Lisa runs up 4 flights of stairs in 22. seconds. She weighs 510. Newtons. If each flight rises 310. cm:
 
  (a) What is her change in potential?
  (b) What average power (watts) was required during the 22. s?
  (c) What minimum horsepower motor would be required to do this?

Question 2

There are 640 acres in a square mile, and 5280 feet in one mile. How many acres are there in a hectare, a square one hundred meters on each side?
 
  What will be an ideal response?

[sylvia]

Answer to Question 1

(a) 6.32 kJ
(b) 287. watts
(c) 0.385 hp

Answer to Question 2

2.47 acres

[sc00by25]

Thanks for the timely response, appreciate it

[lkanara2]

Gracias!