/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q9CQ Why does a dull hypodermic needl... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 11: Q9CQ (page 394)

Why does a dull hypodermic needle hurt more than a sharp one?

Short Answer

Expert verified

A dull hypodermic needle has more surface area than a sharp needle so more force need to be applied.

Step by step solution

01

Finding difference between dull hypodermic needle and sharp needle

The surface area of a sharp needle is small compared to that of a dull hypodermic needle. Since pressure is the force applied per unit area, pressure will be more acute because of this, as pressure and area are inversely related.

02

Explaining the reason behind the larger pain caused by dull hypodermic needle

Inserting a dull needle is more painful than inserting a sharp one. Because pressure will be less in a dull needle, more force will have to be applied to puncture the skin. In the case of a sharp needle, it will puncture easily.

So, the larger surface area of a dull hypodermic needle hurts more than a sharper needle.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Why is force exerted by static fluids always perpendicular to a surface?

How do you convert pressure units like millimetres of mercury, centimetres of water, and inches of mercury into units like newtons per meter squared without resorting to a table of pressure conversion factors?

The density of oil is less than that of water, yet a loaded oil tanker sits lower in the water than an empty one. Why?

Birds such as ducks, geese, and swans have greater densities than water, yet they are able to sit on its surface. Explain this ability, noting that water does not wet their feathers and that they cannot sit on soapy water.

In a remote location near the North Pole, an iceberg floats in a lake. Next to the lake (assume it is not frozen) sits a comparably sized glacier sitting on land. If both chunks of ice should melt due to rising global temperatures (and the melted ice all goes into the lake), which ice chunk would give the greatest increase in the level of the lake water, if any?
See all solutions

Recommended explanations on Physics Textbooks

Circular Motion and Gravitation

Read Explanation

Dynamics

Read Explanation

Magnetism and Electromagnetic Induction

Read Explanation

Solid State Physics

Read Explanation

Waves Physics

Read Explanation

Fluids

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.