- #1
jeeves_17
- 10
- 0
A 200 g, 20-cm-diameter plastic disk is spun on an axle through its
center by an electric motor. What torque must the motor supply to take
the disk from 0 to 1800 rpm in 4.0s? (Given: I = ½ MR2)
Relevant equations
I = 1/2 MR^2
T = Ia
The attempt at a solution
v=0.02m * 1800 rev/min / 4 sec * 60 sec / 1 min * 2 Pi / 1 Rev
v= 10 800 m/s
a = how do i get this?
I = 1/2 (0.2kg)(0.1)^2
I = 0.001
T = Ia
T = (0.001)a
T = answer
is this correct?
center by an electric motor. What torque must the motor supply to take
the disk from 0 to 1800 rpm in 4.0s? (Given: I = ½ MR2)
Relevant equations
I = 1/2 MR^2
T = Ia
The attempt at a solution
v=0.02m * 1800 rev/min / 4 sec * 60 sec / 1 min * 2 Pi / 1 Rev
v= 10 800 m/s
a = how do i get this?
I = 1/2 (0.2kg)(0.1)^2
I = 0.001
T = Ia
T = (0.001)a
T = answer
is this correct?