anonymous
  • anonymous
60 feet per second to km per hour? explain
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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jim_thompson5910
  • jim_thompson5910
do you have anything so far?
anonymous
  • anonymous
no
jim_thompson5910
  • jim_thompson5910
ok let's first write 60 ft per sec as a fraction like this |dw:1441333787839:dw|

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jim_thompson5910
  • jim_thompson5910
how many seconds are in a minute?
anonymous
  • anonymous
60
jim_thompson5910
  • jim_thompson5910
to convert from seconds to minutes, we multiply by the fraction (60 sec/1 min) |dw:1441333859628:dw|
jim_thompson5910
  • jim_thompson5910
notice how I put the "sec" unit on top so it cancels with the "sec" unit in the bottom |dw:1441333911367:dw|
jim_thompson5910
  • jim_thompson5910
with me so far?
anonymous
  • anonymous
yes
jim_thompson5910
  • jim_thompson5910
we now have 60*60 = 3600 ft per min |dw:1441333993066:dw|
jim_thompson5910
  • jim_thompson5910
how would we convert ft/min to ft/hr ?
anonymous
  • anonymous
not sure, thats mostly what i get confused on
jim_thompson5910
  • jim_thompson5910
how many min in an hour?
anonymous
  • anonymous
60
jim_thompson5910
  • jim_thompson5910
what fraction must you multiply by to have the "min" units cancel?
anonymous
  • anonymous
3600 feet over 1 minute ?
jim_thompson5910
  • jim_thompson5910
|dw:1441334074362:dw|
jim_thompson5910
  • jim_thompson5910
agreed?
anonymous
  • anonymous
yeah
jim_thompson5910
  • jim_thompson5910
the min units will cancel leaving hr |dw:1441334154420:dw|
jim_thompson5910
  • jim_thompson5910
what is the result after multiplying?
anonymous
  • anonymous
216000 ft per 1 hour
jim_thompson5910
  • jim_thompson5910
good
anonymous
  • anonymous
then 3280 feet in 1 km so you would do 216000/3280 to get 65..85?
jim_thompson5910
  • jim_thompson5910
I'm getting 1 km = 3280.84 ft approx
jim_thompson5910
  • jim_thompson5910
so you'd have |dw:1441334457073:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1441334543977:dw|
jim_thompson5910
  • jim_thompson5910
my calculator is saying 216000/3280.84 = 65.8367978932224
jim_thompson5910
  • jim_thompson5910
so 60 ft/s = 65.8367978932224 km/hr approximately

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