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? [4 MARKS]

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Solution

Concept: 1 Mark
Application: 3 Marks

$d = 80 c m$

The circumference of the wheel is $= π \times d = π \times 0.8 = 2.51 m$

66km = 66000m

From speed and time, the distance travelled in 10 min
$= 66 \times 10^{3} \times \frac{10}{60}$

$= 11 \times 10^{3}$

$= 11, 000 m$ .

Number of revolutions
$= \frac{T o t a l d i s t a n c e}{c i r c u m f e r e n c e}$

$= \frac{11, 000}{2.51}$

$= 4382.47$ .

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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? [4 MARKS]

Concept: 1 Mark Application: 3 Marks d=80 cm The circumference of the wheel is =π×d=π×0.8=2.51 m 66km = 66000m From speed and time, the distance travelled in 10 min =66×103×1060 =11×103 =11,000 m. Number of revolutions =Total distancecircumference =11,0002.51 =4382.47.