document.write( "Question 825262: The speed of a car is 66 km/hr. If each wheel of the car is 140 cm in diameter, find the number of revolutions made by each wheel per minute. \n" ); document.write( "
Algebra.Com's Answer #497165 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "circumference of wheel in meters:
\n" ); document.write( "c = 2*pi*r
\n" ); document.write( "c = 2*pi*(140/2 cm) * (1/100 m/cm)
\n" ); document.write( "c = 4.398229715025710 m
\n" ); document.write( "---
\n" ); document.write( "by definition:
\n" ); document.write( "c = 4.398229715025710 m/rev
\n" ); document.write( "---
\n" ); document.write( "linear speed of car in meters/minute:
\n" ); document.write( "s = 66 km/hr * (1000 m/km) * (1/60 hr/min)
\n" ); document.write( "s = 1100 m/min
\n" ); document.write( "---
\n" ); document.write( "angular speed of wheel:
\n" ); document.write( "a = s/c
\n" ); document.write( "a = (1100 m/min)/(4.398229715025710 m/rev)
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "a = 250.1 rev/min
\n" ); document.write( "---
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