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anonymous

  • one year ago

60 feet per second to km per hour? explain

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  1. jim_thompson5910
    • one year ago
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    do you have anything so far?

  2. anonymous
    • one year ago
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    no

  3. jim_thompson5910
    • one year ago
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    ok let's first write 60 ft per sec as a fraction like this |dw:1441333787839:dw|

  4. jim_thompson5910
    • one year ago
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    how many seconds are in a minute?

  5. anonymous
    • one year ago
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    60

  6. jim_thompson5910
    • one year ago
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    to convert from seconds to minutes, we multiply by the fraction (60 sec/1 min) |dw:1441333859628:dw|

  7. jim_thompson5910
    • one year ago
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    notice how I put the "sec" unit on top so it cancels with the "sec" unit in the bottom |dw:1441333911367:dw|

  8. jim_thompson5910
    • one year ago
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    with me so far?

  9. anonymous
    • one year ago
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    yes

  10. jim_thompson5910
    • one year ago
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    we now have 60*60 = 3600 ft per min |dw:1441333993066:dw|

  11. jim_thompson5910
    • one year ago
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    how would we convert ft/min to ft/hr ?

  12. anonymous
    • one year ago
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    not sure, thats mostly what i get confused on

  13. jim_thompson5910
    • one year ago
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    how many min in an hour?

  14. anonymous
    • one year ago
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    60

  15. jim_thompson5910
    • one year ago
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    what fraction must you multiply by to have the "min" units cancel?

  16. anonymous
    • one year ago
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    3600 feet over 1 minute ?

  17. jim_thompson5910
    • one year ago
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    |dw:1441334074362:dw|

  18. jim_thompson5910
    • one year ago
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    agreed?

  19. anonymous
    • one year ago
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    yeah

  20. jim_thompson5910
    • one year ago
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    the min units will cancel leaving hr |dw:1441334154420:dw|

  21. jim_thompson5910
    • one year ago
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    what is the result after multiplying?

  22. anonymous
    • one year ago
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    216000 ft per 1 hour

  23. jim_thompson5910
    • one year ago
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    good

  24. anonymous
    • one year ago
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    then 3280 feet in 1 km so you would do 216000/3280 to get 65..85?

  25. jim_thompson5910
    • one year ago
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    I'm getting 1 km = 3280.84 ft approx

  26. jim_thompson5910
    • one year ago
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    so you'd have |dw:1441334457073:dw|

  27. jim_thompson5910
    • one year ago
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    |dw:1441334543977:dw|

  28. jim_thompson5910
    • one year ago
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    my calculator is saying 216000/3280.84 = 65.8367978932224

  29. jim_thompson5910
    • one year ago
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    so 60 ft/s = 65.8367978932224 km/hr approximately

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