Question

plz solve 9th nd 10th sum

Answer 1

$\large \tt AHOY!!$
9. given the radius of the wheel of the tractor = 35cm.

here we have to find the distance travelled by the wheel in 700 revolution.

let's find it's circumference to find the total distance in 700 revolution.

circumference of the wheel = 2πr (since wheels are circular)

= 2 × 22/7 × 35

= 44 × 5

= 220cm

therefore total distance travelled in 700 revolutions = 220 × 700

= 154000cm

in meters = 154000/100 = 1540m

10. ATQ, the car wheel make 5000 revolutions in 11km. we have to find the radius of the wheel.

we know that 1km = 1000m

therefore 11km = 1000 × 11 = 11000m

hence, circumference of the wheel is = 11000/5000 (since it makes 5000 revolutions in 11km)

= 2.2m = 220cm

therefore 2πr = 220cm

=> 2 × 22/7 × r = 220cm

=> 44/7 × r = 220cm

=> r = 220/1 × 7/44

=> r = 5 × 7

=> r = 35cm or 0.35m

$\large \tt HOPE \: THIS \: HELPS!!$