to rastig45.The diameter of the wheel of a vehicle is 5 m.It makes 7 r

1.	to rastig45.The diameter of the wheel of a vehicle is 5 m.It makes 7 revolutions per 9 seconds. What isthe speed of vehicle in Km/h?(a) 34 km/h(c) 54 km/h(d) 45 km/h(b) 44 km/h Sud
Answer» Given,Diameter of wheel = 5 mRadius of wheel r = 5/2 = 2.5 m Circumference of wheel= 2pir= 222/75/2= 22/7 * 5 Distance covered by wheel in 7 revolution = 7circumference= 722/75= 110 m Speed = Distance /time = 110/9 m/sec = 110/9 18/5 = 22*2 = 44 km/hr (b) is correct option

to rastig45.The diameter of the wheel of a vehicle is 5 m.It makes 7 revolutions per 9 seconds. What isthe speed of vehicle in Km/h?(a) 34 km/h(c) 54 km/h(d) 45 km/h(b) 44 km/h Sud

Answer»

Given,Diameter of wheel = 5 mRadius of wheel r = 5/2 = 2.5 m

Circumference of wheel= 2*pi*r= 2*22/7*5/2= 22/7 * 5

Distance covered by wheel in 7 revolution = 7*circumference= 7*22/7*5= 110 m

Speed = Distance /time = 110/9 m/sec = 110/9 * 18/5 = 22*2 = 44 km/hr

(b) is correct option