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提问人：网友doodoogingin 发布时间：2022-01-07

[主观题]

A turntable has a moment of inertia of 3.0×10^-2 kg？m2 and spins freely on a frictionless

bearing at 25 rev/min. A 0.30-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable？

A、0.91

B、1.0

C、0.82

D、1.5

E、2.5

F、11.5

G、3.5

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