The degree measure of the angle through which a pendulum swings if its length is 40 cm and it swings in an arc of length 10 cm is…
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Step-by-step explanation:
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=rl.
It is given that r=75 cm
(i) l=10 cm
∴θ=7510=152 radian
(ii) l=15 cm
∴θ=7515=51 radian
(iii) l=21 cm
∴θ=7521=257 radian
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