The boy rotates a 0.1 kg weight tied to a 0.5 m thread in a vertical plane. Determine the tension force of the thread
| November 25, 2020 | education
The boy rotates a 0.1 kg weight tied to a 0.5 m thread in a vertical plane. Determine the tension force of the thread at the moment the weight passes the lower point of the trajectory, if the rotation speed is 120 rpm.
f = 120 rpm = 120/60 = 2 Hz – rotation frequency
ω = 2пf = 2 * 3.14159 * 2 = 12.6 rad / s – angular velocity
a = ωR = 12.6 0.5 = 79 centripetal acceleration
F = m (a – g) = 0.1 (79 – 10) = 6.9 H – the required thread tension
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