Turntable Speeds 16
October 14th, 2008
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Turntable Speeds 16
Help with physics and angular momentum!?
A thin uniform cylindrical turntable of radius
1.5 m and mass 16 kg rotates in a horizontal
plane with an initial angular speed of 11 rad/s.
The turntable bearing is frictionless. A clump
of clay of mass 7.9 kg is dropped onto the
turntable and sticks at a point 1 m from the
point of rotation.
Find the angular speed of the clay and
turntable.
Answer in units of rad/s.
Use conservation of angular momentum
I(initial) = 1/2*M*R^2 = 1/2*16*1.5^2 = 18 kg-m^2
I (final) = 1/2*M*R^2 + m*r^2= 1/2*16*1.5^2 + 7.9*1^2 = 25.9kg-m^2
so ω(final) = I*ωinitial/I final = 18*11 /25.9= 7.64rad/s
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GARRARD TURNTABLE~SYNCHRO-LAB~16,33,45,78 SPEEDS~MADE IN ENGLAND~SL-65~VINTAGE |  |
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US $120.00 | 3d 7h 30m |
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