A Disc-Shaped Grindstone of Mass 3

question 64

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 is the average torque exerted by the axe on the grindstone?

• A)9.6 mN · m
• B)0.12 N · m
• C)0.75 N · m
• D)0.60 kN · m
• E)0.060 N · m

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Definitions:

Peroxisome

A small, membrane-bound organelle found in the cytoplasm of eukaryotic cells, involved in processes such as lipid metabolism and the detoxification of harmful substances.

Cotyledons

The primary leaves of a seedling, emerging from the embryo of a seed, important for the initial photosynthesis and nutrient absorption in many plants.

Eudicot

A major group of flowering plants that are characterized by having two seed leaves or cotyledons upon germination.

Integuments

Layers of protective tissues surrounding the ovules of plants, which develop into the seed coat upon fertilization.