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A uniform pencil is held horizontal with a thumb at the end and index finger under it 3 cm from the end. If the pencil has a mass of 20g and is 15 m long, what is the force on the index finger due to the pencil?

Expert Solution

Step 1

The length of the pencil is 15 m.

Its mass is 20 g

Thus mass per meter is $\frac{20}{15} = 1.33 g m^{- 1}$

So mass of 3 cm of the pencil is $m' = 1.33 \times . 03 = 0.039 g$

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