plz solve 9th nd 10th sum
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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
radhika4086:
thnksss
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