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A person with compromised pinch strength in their fingers can only exert a norma

ID: 1281488 • Letter: A

Question

A person with compromised pinch strength in their fingers can only exert a normal force of 6.0 N to either side of a pinch-held object, such as the book shown in(Figure 1) .

What is the mass of the heaviest book this person can hold onto vertically before it slips out of his or her fingers? The coefficient of static friction of the surface between the fingers and the book cover is 0.75.

A person with compromised pinch strength in their fingers can only exert a normal force of 6.0 N to either side of a pinch-held object, such as the book shown in(Figure 1) . What is the mass of the heaviest book this person can hold onto vertically before it slips out of his or her fingers? The coefficient of static friction of the surface between the fingers and the book cover is 0.75.

Explanation / Answer

since Mg=2*mu*N        normal force on two sides

heaviset mass it can withstand is

M=2*mu*N/g=2*0.75*6/9.8 Kg=0.9183 Kg

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