Math, asked by 5003427purvithaj2, 16 hours ago

In a wa 4. The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour? ​

Answers

Answered by MysteriesGirl
86

Given

Diameter of wheel = 80 cm

Time = 10 minutes

Speed = 66 km/hr

Concept used

Circumference of wheel = 2πr 

Calculation,

Diameter = 80 cm

Radius = 80/2

Radius = 40 cm

Circumference of wheel = 2πr 

Distance covered = Circumference of wheel

distance \:  \:  =  2 \times  \frac{22}{7}  \times 40

Distance = 1760/7 cm

1 cm = 1/100 m

Distance = 176/70 meter  

176/70 meter covered in 1 revolution

1 m covered in : 70/176 Revolutions - - (i)

Distance covered in 10 minutes = 66 × 10/60

Distance = 11 km

Distance = 11000 m - - - - - (ii)

So 11000 is covered in = 

 \frac{70}{176}  \times 11000

∴ 4375 revolutions

Answered by Anonymous
2

Answer:

Given

Diameter of wheel = 80 cm

Time = 10 minutes

Speed = 66 km/hr

Concept used

Circumference of wheel = 2πr

Calculation,

Diameter = 80 cm

Radius = 80/2

Radius = 40 cm

Circumference of wheel = 2πr

Distance covered = Circumference of wheel

distance \: \: = 2 \times \frac{22}{7} \times 40

Distance = 1760/7 cm

1 cm = 1/100 m

Distance = 176/70 meter

176/70 meter covered in 1 revolution

1 m covered in : 70/176 Revolutions - - (i)

Distance covered in 10 minutes = 66 × 10/60

Distance = 11 km

Distance = 11000 m - - - - - (ii)

So 11000 is covered in =

\frac{70}{176} \times 11000

176

70

×11000

∴ 4375 revolutions

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