Question

A pendulum swings through an angle of 30° and describes an arc 2.2 cm in length.The length of the pendulum _______

a) 12.6 cm

b) 8.4 cm

c) 16.8 cm

d) 4.2 cm​

Answer 1

Answer:

hope that this answer will help you

Step-by-step explanation:

(c)16.8cm

Answer 2

Answer:

Given,

Pendulum swings through an angle of = 30°

Arc length = 2.2 cm

Now,

Length of the pendulum = Radius of sector

of the circle

Now,

=> θ/360 (2πr) = 2.2

=> 30°/360°× 2× 22/7 × r = 2.2

=> 11/21 × r = 2.2

=> r = (2.2×21) / 11

=> r = 4.2 cm

Therefore,The length of the pendulum is = 4.2 cm

So the correct option is - d)

I hope this is helpful to you