Came to the same result as Bill on the added calories needed to bring
the pack up one flight of stairs. But that's just the extra energy now
"stored" in the package as potential energy.
A backwards trace of the energy could look something like this:
To transfer the energy to the package, your muscles has to do work.
Muscles are machines that convert some of its fuel to work, and some to
heat. So the energy for both must come from food, which is where we
usually count calories.
So the number of calories you need to ingest to perform the work is far
greater than Newtonian physics will have you believe from the
perspective of the package. :-)
Jostein
Den 24.06.2017 23.50, skrev ann sanfedele:
Thanks all you smart gents
arrrgh - I answered Bob, and Jack and you hitting "reply" I just noticed
all interesting answers but yours was the one I like best , if your
math _is_ right - it sure FEELS like it...
10 ft celings here - no wonder I'm maintaing my relative svelt
dimensions :-)
a
On 6/24/2017 4:41 PM, William Robb wrote:
On Sat, Jun 24, 2017 at 10:34 AM ann sanfedele <ann...@nyc.rr.com> wrote:
What is the difference in virtual weight of a pack (say, ten lbs) being
carried bys omeone walking on level ground and the same person carrying
the same pack up a flight of stairs?
It's 42.
Actually, it's about 32.4 calories to carry 10 pounds up a flight of
stairs
presuming 10' from floor to floor.
Bill
I'm sure I'm not using the corrrect terms here, I"m sure but I'm looking
for the as if.... related to the stress it puts on my body.
Is it like I'm carrying 5 more lbs? 20 more lbs? etc
answer ON list so ten people don't have to respond :-)
thanks, guys
ann
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