The area of contact between an injection needle and the skin is a very tiny circle with a diameter of 2.54x10cm. If the needle exerts a force of 6.9x10 2N, what is the pressure in Pa?
Added by Justin Adriel Sison A.
Step 1
The formula for the area of a circle is πr², where r is the radius of the circle. The radius is half of the diameter, so in this case, it is 1.27x10^-2 m (remember to convert cm to m by multiplying by 0.01). Show more…
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