1. a) A man weighing 765 N is on a bed of nails. Calculate the pressure exerted by each nail if there are 1,000 nails and each tip has a radius r = 0.500mm (5.00 x 104 m). b) Calculate the pressure exerted on the skin by acupuncture needle of radius r = 0.100mm (1.00 x 10 m) applied with a force of 3.00 N. Ans. a. 9.74 x 10³ Pa b. 1.59 x 108 Pa [Note that the Coletta text uses N/mm², which is a needless use of non-SI units.]

1. a) A man weighing 765 N is on a bed of nails. Calculate the pressure exerted by each nail if there are 1,000 nails and each tip has a radius r = 0.500mm (5.00 x 104 m). b) Calculate the pressure exerted on the skin by acupuncture needle of radius r = 0.100mm (1.00 x 10 m) applied with a force of 3.00 N. Ans. a. 9.74 x 10³ Pa b. 1.59 x 108 Pa [Note that the Coletta text uses N/mm², which is a needless use of non-SI units.]

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Description: 1. a) A man weighing 765 N is on a bed of nails. Calculate the pressure exerted by eachnail if there are 1,000 nails and each tip has a radius r = 0.500mm (5.00 x 104 m). b)Calculate the pressure exerted on the skin by acupuncture needle of radius r

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.

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Question

1. a) A man weighing 765 N is on a bed of nails. Calculate the pressure exerted by each
nail if there are 1,000 nails and each tip has a radius r = 0.500mm (5.00 x 104 m). b)
Calculate the pressure exerted on the skin by acupuncture needle of radius r = 0.100mm
(1.00 x 10 m) applied with a force of 3.00 N.
Ans. a. 9.74 x 10³ Pa b. 1.59 x 108 Pa [Note that the Coletta text uses N/mm², which is
a needless use of non-SI units.]

9. A parcel of air having a volume of 1.00 cm³ (1.00 x 106 m³) at a pressure of one
atmosphere (1.01 x 105 Pa) is at a temperature of 300 K. Calculate the number of
particles.
Ans. 2.44 x 1019

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