Ujian English For Special Purpose

Name : Rahmawati Yusri

NIM : RSA1C311001

1. Design a simple research about the kinetic energy associated with your daily life and arrage your report in accord with the sixth science process skills you have already understood.

kinetic's energy constitutes energy that proprietary object because its power. Outgrow energy kinetic an object equals kelajuannya's mass and square. And formulated by

Ek = ½ mv ²

Where is Ek = Kinetic Energy (Joule)

                                    m = object Masses (kg)

                                    v = kelajuan (m / s)

Need dipertegas that energy kinetic just speaking on kelajuan (not speed), since energy kinetic doesn't give information about power aim.

Can at takings two examples about energy kinetic in day-to-day life which is.

We have once play “ paper propeller ” while we are still are at Elementary School. From there gets we take for example 2 paper propellers that our for with same form (identically), with measure each fan at makes with. Its mean is propeller second paper is made identically. But, for its makings material, we differentiate its material. One of paper propeller we can make from HVS'S paper ordinary with mass m, and another one we can make from manila cardboard paper with mass 2m. Then afters every thing readily, we saming to bring up both of that paper propeller toward blustery with same position. Its mean is vaned that paper is same get wind with same speed too. Both of primeval paper propeller holds tongue then at blow by wind. Momentary after blustery stop blows, between propeller second paper, which that have energy kinetic what do be even greater?

To analisisnya is as follows.

upon was worded that energy kinetic an object equals mass and its speed square. If on case upon, where 2 form identic objects its but different its material (object mass) therefore for energy kinetic object that have greater mass is greater as compared to fan mass with little mass. To analisis more that the greater mass and kelajuan is moving object therefore energy kinetic which is resulted will the greater too. It has also been is revealed above that energy kinetic equals it kelajuan mass and square.

To prove it we can account it as follows.

paper propeller I (With mass = m)	paper propeller II. (With mass = 2m)
Ek = ½ m v 2 Ek = ½ m v 2	Ek = ½ mv 2 Ek = ½ 2m v 2 Ek = mv 2

Clear different, known that really mass correctness and kelajuan regards energy kinetic an object. (Ek paper propeller I< Ek paper propeller II)

2. Describe an experiment which associated with the following terms: pendulum, frictional force and highest point. Then enter the terms into the procedure so that these terms included in your experiment.

Pendulum  are bonded object on one string and gets sway wholly independently and Periodic.  one that as job basic of one antic wall clock that have oscillation. In Physics, this principle found first time on year 1602 by Galilleo Galillei , that perioda (so long motion one oscillation, T ) regarded by long strings and acceleration gravitation following formula:

at mana   are elongated dan 's string  adalah velocity and gravitation.

On pendulum, inspire happening friction among string tip with still at ignores since its friction point weeny.

For example attempt it is

Material and Tool:

-           Yarn along 30 cm

-          Still

-          Object gets mass 5 gr

-          Roll

-          Stopwatch

-          Bow

Procedure

1. Fasten object that gets mass 5 gr with yarn, then fastens yarn with still so distance among still with object that gets mass 5 gr previously is 30 cm (Measure by use of roll).

2.  By use of Bow, object spectacular gets mass 5 gr previously with outgrows angle 30 ⁰ , then releases. (Measure with roll, its formed deviation by corner of)

3. observe that happening (Computing gets what its frequency, its deviation (dot most in height), and computing what there is happening fiddle style on pendulum)

3. make a simple calculation about electrical using the formula your well known. Write done your solution and explain it by using your sentence (change the number or symbol)

Coulomb’s Law

The first quantitative investigation of the law of the force between charged bodies was carried out by Charles Augustian the coulomb (1736-1806). Coulomb found that the force of attraction or repulsion between two “point charges,” that is, charged bodies whose dimensions are small compared with the distance r between them, is inversely proportional to the square of this distance.

The force also depends on the quantity of charge on each body. In practice, however the charge of the body is expressed om terms of a unit much larger than the charge of an individual electron or proton. We shall use the letter q or Q to represent the charge of a body, postponing for the present the definition of the unit charge.

The concept quantity of charge was not clearly appreciated in Coulomb’s time and no unit of charge or method of measuring it had been devised. Thus, although Coulomb did not state his conclusions in this form, his experiments showed that the force between two point charges q and q’ is proportional to the product of these charges. The complete expression for the force between two point charges is therefore

F = k qq’/r²                 

Where , F = coulomb’s force (Newton)

              k = konstanta = 1/4пε₀ = 9.10⁹ Nm²/c²

              q and q’ = electric charge 2 body (coulomb)

  r = The distance between two body (m)

Where k is a proportional constant whose magnitude depends on the units in which F, q, q’, and r are expressed. Equation above is the mathematical statement of what is known today as Coulomb’s law: The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Example :

two point that get content with originally spaced 1 cm mutually refuses to refuse in style as big as 0,9 N. That dot second that style refuses to refuse it as 0,1 N. Therefore distance both of present the point is...

Solving;

Know : r = 1 cm

            F₁ = 0,9 N

            F₂ = 0,1 N

Ask : The distance between the point is ?

Answer :

            F = k qq’/r²

Because the charge of the two point is same, so we can to take the formula be

            F ~ 1/r²

F is inversely with square of the distance.

So, the conclusion from this statement is progressively high of the distance between the charge of the body so the square that distance come be largest its will make the coulomb force will be smallest.

F₁ / F₂  = 1/r₁² / 1/r₂²

0,9N/0,1N = (r₂/r₁)² ------à r₂ = 3r₁ à r₂ = 3 (1 cm) = 3 cm…

So the answer is r₂ = 3 cm

4. make an essay about sound as a wave. Then show at least three evidences and exemplifying about it.

sound wave in midair constitute longitude wave. Amplifier vibration result pressure variation on air. The creep’s yielding pulse airs to move come away pressure source. After the creep airs to pass, air molecules look back over positions originally. So, while undulates to creep molecule longitude  just air vibrant and not following creep. 

Sound as undulate as longitude gets to creep through drd substance form, which is solid, molten and gas. But then sound wave can't creep through vacuum (air-less). Sound creeps to pass through a medium by moves energy kinetic of a molecule goes to another molecule in medium that. Sound creep in medium faster solid substance as compared to creep on hydrogen and gas. It caused by the distance between the molecul in shorter solid substance than on hydrogen and energy kinetic's gas so transfer faster happening. Can be taken for example. On epoch before, stikc’s frequent men their ear goes to earth to hear or measures walking someone distance toward it. Nah that constitutes a that example substance thickly as medium as creep undulates faster sound than 2 another substances which is gas, and moltens. 

Included sound wave undulate mechanical, have severally character / mechanical wave characteristic, as: 

1. Requiring medium to creep (water, air, solid substance). 

Sound do ever we find wherever, provided that locally available air, water or solid object. But while we observe vibrant sound source at air-less space, therefore we won't hear sound as one we hear at earth. 

2. Constituting longitude wave. 

Mechanical wave available one gets to form longitude, its example is sound. But there is also that gets to form transversal, its example is undulate on string. 

3. Resultant by trouble as vibration of bagpipe, or object even chatters another. 

Each vibrant object must result sound. But don't every thing gets to be heard by our ear, depend frequency, undulate energy and sound source distance that from us. 

4. Can't experience diffraction, polarization, refraction, and another phenomena that just experienced by transversal's wave. 

Sound wave we can recognize through phenomena that be evoked, amongst those resonance, elevating, and doppler effect.

1. Resonance

Resonance is incident following chatter an other object effect object that is jarred. Both of object that beresonansi will have same frequency or the one object frequency constitute object frequency multiple that another. 

If there is one object chatters and most link with other object that have same natural frequency, therefore that thing will force object both of following chatters

Scene resonates this generally happens in many bagpipe component, amongst those string

-           String

On wisp strings secondly its tip be tied-up, as aught on gitas's bagpipe (acoustic guitar, not electric guitar because electric guitar get voice because electric power help), while is plucked therefore on string will most transversal's waveform that gets interference so result stationary wave. That stationary wave creeps in midair longitude ala as undulate as sound until come unto our ear. 

This transversal's wave form repetitive patterns on each its harmonic step, one that is figured under: 

fo =,  λ o = 2 l

F1 =,  λ 1 = l

that pattern always cycles until found by compare among base toned frequency: first overtone: second overtone: ... are 1: 2: 3: 4: ... 

equation to look for frequency on strings is

f _n = v / 2n = (n + 1)v / 2l

As has already been named above that resonation's guitar string. This resonance happening among resulting voice by string with board on sectioned spatial voice. Upon pluck string on toned given therefore that voice will thru stream saddle. Voice or tone that gets to sadlle this, then passes through place bridge string to be fastened. Voice that most waylays on this bridge part then input goes to hole that exists at badang's middle part acoustic guitar. And then here that voice at p roses becomes lovely. One of requisite it is warm up made from guitar kay the lot will result voice that nicely been compared with guitar body that at makes from timbered mixture material and another.

2. Elevating (Pelayangan)

Elevating can happen if available two or more appreciative sound source its frequency a stone's throw. The difference frequency which little this is that we knows by elevating.

Example elevating is sound of guitar game that don't be keyed with every consideration (fals). On sound debilitated interference heard unstable / rock. Sound of wave second that heard as umpteen as sound which mutually overtaking is not one paduan. On menguat's interference sound heard by stable / not rock. Sound of wave second that heard as one paduan.

3. Dopller's effect

If sound and audience source moves mutually approach, therefore frequency which is heard greater than sound source, meanwhile sound and audience source moves mutually come away, therefore frequency which is heard smaller than sound source. This scene at conceive of doppler effect.

Its example.

While is our friend screams while approach us, therefore we will hear its voice excelsior while hover towards we. But, if our friend goes to restrain from us while speaking therefore getting far we won't can hear its voice again.

Upon one deluge of car moves to approach us while sound honk, therefore we hear that honk tone becoming tall. Hereafter, if honk is still sound car afters pass and mobile come away us, therefore we will hear honk tone get to contemn and finally vanish.