Question

the wheel of a car are of diameter 60 cm is how many complete revolutions does does each wheel make in one minute when the car is travelling at a speed of 8.5 km per hour​

Answer 1

Answer:

Speed of the car =66km/hr

∴ Distance travelled by the car in 1hr or 60 minutes is 66km

⇒ Distance travelled by the car in 10 minutes is

60

66

×10=11km=11×1000×100cm

Diameter of car wheel =60cm

∴ radius of car wheel =30cm

∴ Circumference of the wheel =2πr=2×

7

22

×30=

7

1320

cm

We know that,

Circumference of the wheel = Distance travelled by the car when its wheels take one complete revolution =

7

1320

cm

∴ Number of revolutions made by wheels in 10minutes is given by

distancetravelledbythecarwhenitswheelstakeonecompleterevolution

distancetravelledbythecar10minutes

=

7

1320

11×1000×100

=

1320

77×1000×100

=5833 revolutions

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Answer 2

Answer:

Given

Diameter of wheel (D)=80 cm

Radius (r)=

2

80

=40 cm.

1 complete revolution of wheel = Circumference of wheel (C)

C=2πr=2π×40=80π cm

C=0.8π m

Speed of the car =66 km / hr.=

60

66×1000

m/ min.

∴ Speed of the car =1100 m / min.

Therefore, in 10min., the car will travel a distance of 1100×10=11000 m

No. of revolutions of wheel =

0.8π

11000

=

0.8×22

11000×7

=4375

Each wheel of the car makes 4375 complete revolutions in 10 min.

Step-by-step explanation:

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