The radius of a wheel of a car is 21 ,cm. If | vedclass

Name: PDF Generator App | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

The distance covered in $1$ rotation $=$ The circumference of the wheel

$=2 \pi r$

$=2 	imes \frac{22}{7} 	imes 21$

$=132 cm$

Now, the d

Vedclass · Accepted Answer

$63.36$

Vedclass · Answer

The distance covered in $1$ rotation $=$ The circumference of the wheel

$=2 \pi r$

$=2 	imes \frac{22}{7} 	imes 21$

$=132 cm$

Now, the distance covered in $1$ hour

$=$ the distance covered in $60$ minutes

$=60 	imes$ the distance covered in $1$ minute

$=60 	imes$ the distance covered in $800$ rotations $1$ rotation

$=(60 	imes 800 	imes 132) cm$

$=\frac{60 	imes 800 	imes 132}{100} m$

$=\frac{60 	imes 800 	imes 132}{100 	imes 1000} km$

$=\frac{48 	imes 132}{100} km$

$=63.36 km$

Thus, the speed of the car is $63.36 km / h$.

The radius of a wheel of a car is $21 \,cm$. If it makes $800$ rotations per minute, find the speed of the car in $km / h$.

Similar Questions

Find the area of the shaded region in $Fig.$ where arcs drawn with centres $A , B , C$ and $D$ intersect in pairs at mid-points $P , Q , R$ and $S$ of the sides $AB , BC,$ $CD$ and $DA ,$ respectively of a square $ABCD$ (Use $\pi=3.14)$ (in $cm ^{2}$)

In $\odot( O , r) \overline{ OA }$ and $ \overline{ OB }$ are two radii perpendicular to each other. If the, perimeter of the minor sector formed by those radii is $20\,cm ,$ then $r=\ldots \ldots \ldots . . . cm$

The diagram below is formed by three semicircles. If $OA = OB =70\, cm ,$ find the area of the figure formed. (in $cm^2$)

The closed figure formed by an arc of a circle and the radii through its end points is called .........

Will it be true to say that the perimeter of a square circumscribing a circle of radius $a \,cm$ is $8 a \, cm ?$ Give reasons for your answer.