Question

solve this question mate ​

Answer 1

Answer:

speed is 366.67 km/hr

Step-by-step explanation:

speed in km/hr

circumference* revolution per second*(5/18)

circumference=2*π*r

r=d/2

$speed \: in \: km \: per \: hr = 2 \times \frac{22}{7} \times \frac{84}{2} \times 5 \times \frac{5}{18} = 366.67km \: per \: hr$

Answer 2

Answer:

47.52 km/h.

Step-by-step explanation:

Question:

A wheel of a car is making 5 revolution per second.if the diemeter is 84 cm.find it speed in kilometres per hour.

Given that:

Th diemeter of the wheel of a car is 84cm.

The wheel make 5 revolution in 1 sec.

To find:

The speed of the car in km/h.

Solution:

Distance covered in 1 revolution = π×d

$= ( \frac{22}{7} \times 84)cm$

=> 264 cm

Distance covered in 1 second = π×d

=> (5×264)

=> 1320.

Distance covered in 1 second = (60×60×1320)cm

=> 4752000cm

$= > ( \frac{4257000}{1000 \times 100} )km$

=> 47.52 km/h

So,the speed of the car is 47.52 km/h.

${}^{ \hope \: its \: help \: you.}$