document.write( "Question 286448: A wheel of a car of radius 21cm is rotating at 600 RPM. What is the speed of the car in km/hr? \n" ); document.write( "

Algebra.Com's Answer #207753 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
first find out how many cm in a km
\n" ); document.write( " $\"100\"$ cm/m x $\"1000\"$ m/km = $\"10%5E5\"$ cm/km
\n" ); document.write( "Now how far does the car go in 1 revolution of the wheel?
\n" ); document.write( "It goes 1 circumference which is
\n" ); document.write( " $\"C+=+2%2Api%2Ar\"$
\n" ); document.write( " $\"C+=+2%2A3.141%2A21\"$
\n" ); document.write( " $\"C+=+131.947\"$ cm
\n" ); document.write( "How far does the car go in 1 min?
\n" ); document.write( " $\"600\"$ revolutions/min
\n" ); document.write( " $\"131.947\"$ cm/rev x $\"600\"$ rev/min = $\"79168\"$ cm/min
\n" ); document.write( "Now find this in cm/hr
\n" ); document.write( " $\"60\"$ min/hr x $\"79168\"$ cm/min = $\"4750084.1\"$ cm/hr
\n" ); document.write( "Now find this in km/hr
\n" ); document.write( " $\"4750084.1\"$ cm/hr x $\"1%2F10%5E5\"$ km/cm = $\"47.5\"$ km/hr
\n" ); document.write( "check my math, though
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