The wheel of a cart is making 4 revolutions per second. If the diameter of the wheel be 84 cm, find its speed.

34 km /hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

48 km /hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

38 km /hr

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

42 km /hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C
38 km /hr

Radius of wheel = 84 cm

The distance travelled in one revolution = $2 π r$

$= 2 \times \frac{22}{7} \times 42$ cm = 264 cm.

The distance travelled in 4 revolution = 4 $\times$ 264 cm = 1056 cm.

Distance travelled in one hour= $\frac{1056 c m \times 3600 s e c}{100000}$

= 38 km

So, its speed is 38 km /hr.

Suggest Corrections

Similar questions

The wheel of a cart is making 5 revolutions per second. If the diameter of the wheel is 84 cm, find its speed in km/hr. Give answer correct up to the nearest km.

Q. The wheel of a cart is making 5 revolutions per second. If the diameter of the wheel is 84 cm, find its speed in km per hour.

Q. The wheel of a cart is making 5 revolutions per sec. If the diameter of the wheel is 84cm, find its speed in km/hr. Give answer correct to the nearest km.

The wheel of a cart is making 5 revolutions per second. If the diameter of the wheel is 84 cm, find its speed in km/hr. Give your answer correct to the nearest km.

Ankit drives 120 km at 60 km/hr and the next 120 km at 40 km/hr. His average speed during the entire trip is:

Join BYJU'S Learning Program

The wheel of a cart is making 4 revolutions per second. If the diameter of the wheel be 84 cm, find its speed.

The correct option is C 38 km /hr Radius of wheel = 84 cm The distance travelled in one revolution = 2πr =2×227×42 cm = 264 cm. The distance travelled in 4 revolution = 4 × 264 cm = 1056 cm. Distance travelled in one hour= 1056 cm×3600 sec100000 = 38 km So, its speed is 38 km /hr.