Physics question about circular motion

4. A

5. D

Explanation:

4) Apply Newton's second law in the radial direction (towards the center):

∑F = ma

T = mv²/r

v = √(Tr/m)

Given T = 30 N, r = 1.5 m, m = 2 kg:

v = √(30 N × 1.5 m / 2 kg)

v = 4.74 m/s

5) Apply Newton's second law to the stopper in the radial direction (towards the center):

∑F = ma

T sin θ = Mv²/(L sin θ)

T = Mv²/(L sin² θ)

we need answer choices

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.