find the angle in radian through which a pendulum swing if it's length is 75cm and the tip describes an arc if length
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We know that in a circle of radius r unit, if an arc of length l unit subtends an angle θ radian at the centre, then θ=
r
l
.
It is given that r=75 cm
(i) l=10 cm
∴θ=
75
10
=
15
2
radian
(ii) l=15 cm
∴θ=
75
15
=
5
1
radian
(iii) l=21 cm
∴θ=
75
21
=
25
7
radian
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