Posted by Allie on Friday, December 2, 2011 at 8:32pm.
Suppose you spend 30.0 minutes on a stairclimbing machine, climbing at a rate of 75 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result?
I know the answer to the first part is
10.4%
but i'm not sure how to find this second part...
If your actual efficiency is 0.20, how many kcal did you really burn?
___________kcal

Physics  drwls, Friday, December 2, 2011 at 8:40pm
To have an efficiency of 20% and to have done the same amount of work, you need to have burned fewer kcal, by a ratio of 10.4/20. That makes 359 kcal

Physics  Shawn, Sunday, December 4, 2011 at 7:16pm
How did you get the first part?
Answer This Question
Related Questions
 physics  you spend 30.0 minutes on a stairclimbing machine, climbing at a ...
 physics  calculate the number of kilocalories needed to climb 232 stair steps (...
 physics  (a) calculate the number of kilocalories needed to climb 232 stair ...
 physics  A record was set for stair climbing when a man ran up the 2300 steps ...
 Physics  A record was set for stair climbing when a man ran up the 2100 steps ...
 math  A hot air balloon was at a height of 60 feet above the ground when it ...
 Math  A copy machine makes 60 copies per minute. A second copy machine makes 80...
 operations management/supply chain  Suppose you are managing a service system ...
 math can you please check my work  Can you please check my work. I asked this...
 Basic Banking Operations  A machine at Staples photocopies 12 1/4 pages per ...
More Related Questions