Chapter 9, Problem 50P

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# To lift a wire ring of radius1.75 cm from the surface of a container of blood plasma, a vertical force of 1.61 × 10−2 N greater than the weight of the ring is required. Calculate the surface tension of blood plasma from this information.

To determine
The surface tension of blood plasma.

Explanation
The surface tension of blood plasma is Î³=F/Ltotal=F/2(2Ï€r) since the ring has two sides (inside and outside).

Given info: The vertical force on the ring is 1.61Ã—10âˆ’2â€‰N and the radius of the ring is 1.75â€‰cm .

The formula for the surface tension of blood plasma is,

Î³=F4Ï€r

• F is the vertical force.
• r is radius of the ring.

Substitute 1.61Ã—10âˆ’2â€‰N for F and 1.75â€‰cm for r to find Î³

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