<PRE><B>Question 966308</B>
 the wheel of a cart is making 5revolutions per second.
 if the diameter of the wheel is 84 cm
find the speed of cart in km/hr.
:
find the distance the wheel travels in 1 sec.
d = {{{pi*84*5}}} 
d = 1319.47 cm which is 1319.4/100 = 13.1947 meters in 1 sec
Find the speed in km/hr (3600 sec in 1 hr)
{{{s = (3600*13.1847)/1000}}}
s = 47.5 km/hr</PRE>