Question 930554
Speed of the car is 47.52 km / hr. A lorry wheel is rotating at 400 RPM. What is the radius (in cm) of a lorry wheel if the lorry has a same speed with car?
***
r=radius(cm)
{{{400(rev/min)2(pi)r(cm/rev)60(min/hr)(m/100cm)(km/1000m)=47.52(km/hr))}}}
{{{(400*2(pi)r(60))/(10^5)=47.52}}}
{{{r=(10^5*47.52)/(400*2(pi)(60))=31.51 (cm)}}}