Sunday

April 19, 2015

April 19, 2015

Posted by **Harold** on Tuesday, March 17, 2009 at 12:33am.

I say half as much?

- Physics -
**Dr Russ**, Tuesday, March 17, 2009 at 7:52amuse Energy = 0.5 mv^2

(this should use SI units but the conversion factors will disappear in the ratio)

at 0 the energy is 0

at 30 the energy is =0.5xmx30^2

the enrgy required to go from 0 to 30 is 0.5xmx30^2 - 0 = 0.5xmx30^2

at 60 the energy is = 0.5xmx60^2

the enrgy required to go from 30 to 60

is 0.5xmx60^2 - 0.5xmx30^2

which is 0.5xm(60^2 - 30^2)

so the ratio is

0.5xm(60^2 - 30^2)/0.5xmx30^2

= (60^2 - 30^2)/30^2

times as much

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