Question

KI
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16. A wheel of a cart is making 4 revolutions per second
If the diameter of the wheel is 84 cm, find its speed
.​

Answer 1

Step-by-step explanation:

Given−

Thediameterofthewheelofacar=84cm.

Thewheelmakes5revolutionsin1sec.

Tofindout−

Thespeedofthecarinkm/hr.

Solution−

ThediameterDofthewheel=84cm=84×10

−5

km.

∴ThecircumferenceC=πD=

7

22

×84×10

−5

km=264×10

−5

km.

Time=t=1sec=

60×60

1

hr.

Distancecoveredin5revolution=5×C=5×264×10

−5

km=132×10

−4

km.

∴Thespeedofthecar=

time

distance

=

60×60

1

hr

132×10

−4

km

=132×10

−4

×60×60km/hr

=47.52km/hr.