how do u convert the following MJ to J km/h to m/s 25 kN to ? (i don't know what)
Nov 12, 2006 #1 soulja101 61 0 how do u convert the following MJ to J km/h to m/s 25 kN to ? (i don't know what)
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Nov 12, 2006 #2 Dorothy Weglend 247 2 I usually use fractions. If I wanted to convert 10 ft/s to inches/min, for example, I would do: 10 ft/s * 12 inches/1 ft * 1 min/60 s = 2 inches/s Since there are 12 inches in a foot, and 60 seconds in a minute, this is just multiplying by 1, in a creative way. Just use this idea, and you will be converting units in no time at all. Dorothy
I usually use fractions. If I wanted to convert 10 ft/s to inches/min, for example, I would do: 10 ft/s * 12 inches/1 ft * 1 min/60 s = 2 inches/s Since there are 12 inches in a foot, and 60 seconds in a minute, this is just multiplying by 1, in a creative way. Just use this idea, and you will be converting units in no time at all. Dorothy
Nov 12, 2006 #3 Integral Staff Emeritus Science Advisor Gold Member 7,253 64 Surely you have some idea as to how to do this. Am I correct in reading the first to be converting MegaJoules to Joules. You should be able to figure that out with a bit of thought. Lets go through the conversion of [itex] \frac {km} h [/itex] to [itex] \frac m s [/itex] There are 1000 m per km and 3600 s per h so [tex] \frac {km} h \times \frac {1000m} {1km} \times \frac {1h} {3600s} [/tex] examine the units in this expression, note that km appears in both the numerator and denominator, so can be canceled, leaving only m. The same is true for h. Do the arithmetic. Last edited: Nov 12, 2006
Surely you have some idea as to how to do this. Am I correct in reading the first to be converting MegaJoules to Joules. You should be able to figure that out with a bit of thought. Lets go through the conversion of [itex] \frac {km} h [/itex] to [itex] \frac m s [/itex] There are 1000 m per km and 3600 s per h so [tex] \frac {km} h \times \frac {1000m} {1km} \times \frac {1h} {3600s} [/tex] examine the units in this expression, note that km appears in both the numerator and denominator, so can be canceled, leaving only m. The same is true for h. Do the arithmetic.
Nov 12, 2006 #4 soulja101 61 0 lost i ve tried all i know is a MJ a is a like 1000J a second but it doesn't work out for my answers
Nov 12, 2006 #5 Dorothy Weglend 247 2 1000 J/s is a Kilo Watt. Mega is not 1000, and there is no second in kilo or in your problem. Look in your physics book for the definitions of metric prefixes. Dorothy
1000 J/s is a Kilo Watt. Mega is not 1000, and there is no second in kilo or in your problem. Look in your physics book for the definitions of metric prefixes. Dorothy