A turntable must spin at 33.4 rpm (3.50 rad/s) to play an old-fashioned vinyl record. how much torque must the motor deliver if the turntable is to reach its final angular speed in 1.0 revolutions, starting from rest? the turntable is a uniform disk of diameter 30.5 cm and mass 0.21 kg.
In order to compute the torque required, we may apply Newton's second law for circular motion: Torque = moment of inertia * angular acceleration
For this, we require the angular acceleration, α. We may calculate this using: α = Δω/Δt The time taken to achieve rotational speed may be calculated using: time = 1 revolution * 2π radians per revolution / 3.5 radians per second time = 1.80 seconds
α = (3.5 - 0) / 1.8 α = 1.94 rad/s²
The moment of inertia of a thin disc is given by: I = MR²/2 I = (0.21*0.1525²)/2 I = 0.002
