A Disc-Shaped Grindstone of Mass 3 $\times$ 10^-3 J
C)4 $\times$ 10^-5 J
D)1

question 34

Multiple Choice

A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min.After the power is shut off,a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later.What was the stone's initial kinetic energy when the power was turned off?

• A)19 J
• B)3.8 \(\times\) 10^-3 J
• C)4.8 \(\times\) 10^-5 J
• D)1.9 \(\times\) 10^-3 J
• E)2.4 \(\times\) 10^-2 J

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