Density
Akopọ
Lead is called heavy and cork is called light, yet a tiny lead pellet weighs far less than a whole cork life-ring. What we really mean is that lead packs much more mass into each unit of volume. That idea, mass per unit volume, is density, and it lets you predict whether a pebble sinks, why an iron ship floats, and which liquid settles on top when two will not mix.
In this lesson you will define density, learn the equation that links mass, volume and density, and measure it for a liquid, a regular solid and an awkward irregular solid using displacement. You will then use density data the way examiners ask: to decide whether an object floats or sinks, and whether one liquid floats on another.
Awọn Afojusun
- Define density as mass per unit volume; recall and use the equation m ρ = V
- Describe how to determine the density of a liquid, of a regularly shaped solid and of an irregularly shaped solid which sinks in a liquid (volume by displacement), including appropriate calculations
- Determine whether an object floats based on density data
- [Supplement] Determine whether one liquid will float on another liquid based on density data given that the liquids do not mix
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Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Density. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Density is defined as A. mass times volume B. mass divided by volume C. volume divided by mass D. weight divided by area Answer: B
- A block has mass 240 g and volume 30 cm3. Its density is A. 0.125 g/cm3 B. 8 g/cm3 C. 80 g/cm3 D. 7200 g/cm3 Answer: B
- A stone of mass 75 g raises the water in a measuring cylinder from 40 cm3 to 65 cm3. Its density is A. 1.15 g/cm3 B. 3.0 g/cm3 C. 1.88 g/cm3 D. 25 g/cm3 Answer: B
- An object will float in a liquid if the object's density is A. greater than the liquid's density B. equal to its own weight C. less than the liquid's density D. equal to the liquid's mass Answer: C
- The density of water is 1.0 g/cm3. In kg/m3 this is A. 0.001 B. 1 C. 100 D. 1000 Answer: D
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Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Density
Which weighs more, a ton of feathers or a ton of bricks? This old riddle plays with the distinction between mass and density. A ton is a ton, of course; but bricks have much greater density than feathers, and so we are tempted to think of them as heavier. (See Figure 11.4 .) Density , as you will se
"College Physics: Density" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/11-2-density. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Archimedes’ Principle
When you rise from lounging in a warm bath, your arms feel strangely heavy. This is because you no longer have the buoyant support of the water. Where does this buoyant force come from? Why is it that some things float and others do not? Do objects that sink get any support at all from the fluid? Is
"College Physics: Archimedes’ Principle" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/11-7-archimedes-principle. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Density? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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