. The diameter of the wheel of a car is 77 cm.
How many revolutions will it make to travel
121 m?
(a) 45
(c) 50
(b) 24
(d) 55
Answers
Answer:
50 revolutioms
Step-by-step explanation:
distance covered in one revolution
= πd
= 22/7 *77
=22*11
= 242 cm
distance to be covered = 121 m
= 12100 cm
no. of revolution
= 12100/242
= 50 revoltions
Answer:
(c) 50
It will need 50 revolutions to travel 121 m.
Step-by-step explanation:
The wheel travelled distance of 121 m
The diameter of wheel of a car = 77 cm
Radius = ?
Radius (r) = diameter / 2
⇒ 77 / 2
⇒ 38.5
Radius (r) = 38.5 cm
Find the circumference of car's wheel :
Circumference = 2 π r
⇒ 2 × 22 / 7 × 38.5
⇒ 1694 / 7
⇒ 242 cm
Hence,
242 cm = 1 revolution
The wheel travelled = 121 m
1 m = 100 cm
⇒ 121 × 100
⇒ 12100 cm
242 cm = 1 revolution
12100 cm = ?
⇒ 12100 / 242
⇒ 50
Hence,
12100 cm = 50 revolutions
∴ (c) 50
It will need 50 revolutions to travel 121 m.