UJIAN AKHIR SEMESTER ENGLISH FOR SPECIAL PURPOSE

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

    Answer : 

   Every moving object has energy. The energy possessed by a moving object is called kinetic energy. So  that the kinetic energy or energy of motion (also called kinetic energy) is the energy possessed by an object due to its motion. To be sure that every moving object has energy consider the following examples:

A catapult is drawn and then released so that the stone was in the sling glide with a certain speed. And moving the stones have energy. If directed at the neighbor's chickens chickens are most likely due to limp helplessly beaten stone. In this example the stone do the work in chickens. Or on wheeled vehicles moving at a certain speed on a highway has kinetic energy. When two vehicles collide on the move, then we can be sure the vehicle will be brought to the workshop for repair. Damage caused by the collision occurred because the two cars were initially engaged to do business / work against each other. Or when the builder hit the nail using a hammer, hammer-driven builders do work on the nail. Any moving object exerts a force on another object and move it as far as a certain distance. Moving objects have the ability to do work, therefore can be said to have energy. Energy on a moving object is called kinetic energy. The word comes from the Greek kinetic, kinetikos, which means "movement". when a moving object, the object must have speed. Thus, we can conclude that the kinetic energy is the energy possessed by the object movement or speed. The formula to find the kinetic energy is by using the following formula : 

EK = ½ mv ²

with, EK = kinetic energy

         m = mass

         v = velocity

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.

     Answer :

     Experiments frictional force :

   friction between an object and the track surface can inhibit the rate of the object. Then what would     happen if the force of friction is created from water that was in a bottle that was rolled? To answer that question let's do the following experiment :

the presedure :

1. prepare tools and materials needed are : two bottles of the same size and aqua water.

2. Insert enough water to one bottle. And one more bottle left blank.

3. Hold the bottle at the same position. Then roll both simultaneously. Keep the same force exerted on 

     the second bottle. What happens to the motion of both the bottle?

Bottle of water moves slower than the empty bottle. This is because the water in the bottle come to move along with the movement of the bottle. Surface contact between the water and the bottle creates friction that inhibits the rate of bottle. So is the gravity of the water pressure so that makes friction between the outer surface of the bottle and the track surface becomes larger. As a result of these two frictional forces, the water bottle becomes slower.

         Experiment pendulum :


    Subsequent experiments were simulated to determine the acceleration of gravity using a pendulum swing or pendulum cool. Pendulum motion is harmonic motion around the equilibrium point at him as the head or swinging from side to side. Unlike the spring swing that moves along a vertical line or called a nodding motion.
      With the pendulum swing that relies on factors strap length and value of the acceleration of gravity, it is specifically for the earth can be used to determine in a simple gravity than methods that rely on water drops in free fall motion.

Step experimental pendulum swing (or Pendulum Pendulum Mathematically)

1. Determine the length of rope used.
2. Pull rope with an angle ranging from 1o
3. Remove the rope and let the pendulum swing 10 times and note the long swing
4. Swing time 10 times then determined by dividing the value of the period by the number of swings 
    that do (10 times) before.
5. Use the equation to determine the period of a pendulum swing gravitational acceleration values
    ​​expressed in this simulation.

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).

     Answer :

      Currently electric energy has been a driving force in human life. Almost all home appliances, office to industrial electrical needs. Power is the amount of energy (effort) per one unit of time. Great power is formulated as follows :

  P= W / t         or 

P = V ² / R       or 

P = V I

        by,

        P= power (watts or J / s) 

        V = potential difference (V)

        W= energy (J) 

        R = resistance (Ω)

        t= time (s) 

        I = strong current (A)

        For example:

            In a written bulb 44 W / 220 V. if the bulb is connected to 110 V voltage source, determine :

            a . power of the lamp

            b. current flowing

                  answer :

                  known :

                  P1 = 44 W V

                  V1 = 220 V

                  V2 = 110 V then P2 = ......???

              R = V ² / P, because the prisoners remain,

              V1 ² / P1 = V2 ² / P2

              (220V) ² / 44W = (110V) ² / P2

              48400V ² / 44W = 12100V ² / P2

              1100V²  / W = 12100V ² / P2

               P2 = 12100V ² / 1100V ² / W

                      P2 = 11 W

                  

                As for the current flowing is :

               P = V I

              11 W = 110 V. I

               I = 11 W/110V

               I = 0.1 A

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

            about it.
            Answer :
                     
               Sound is closely linked to a sense of "hear". Voice / sound is usually spread through the air. Voice / sound can not propagate through a vacuum. The sound produced by the vibration of an object. During shaking, the pressure difference occurs in the surrounding air. The pattern of oscillations that occur is called the "WAVE". So what is a wave??

            Did you ever go to the beach? Sure is fun, is not it? So the beauty of God's creation. On the beach you can see the waves. Waves are seen surging from the middle towards the coast and become more remote, and finally hit the coast. So, what exactly is the waves?

      When you attend a flag-raising ceremony at the school, you see the flag fluttering in the wind. Have you ever noticed how the motion of the flag? The incident ocean waves or waving the flag is an example of the wave. So, what exactly is it a wave?

              By the time you move the rope up and down, saying that you provide harassment on the ropes. If the harassment is done continuously, there will be vibration. After giving harassment or vibration, you will see something that propagate on the string. Something called a wave. Thus, the waves are propagating vibrations that propagate or harassment. You can communicate with other people mostly using sound waves or waves bunyi.Kamu can listen to the radio or watch television because of the radio waves.

           Based perambatnya medium, the waves can be divided into two parts, namely mechanical waves and electromagnetic waves. Mechanical wave is a wave in the propagation requires a medium, such as a rope waves, water waves, and sound waves. Electromagnetic waves are waves that can propagate without a medium, such as radio waves, light waves, and radar waves. Of the two types of waves, which would you learn is a mechanical wave. What are propagated by these waves?

          By the time you shook the rope, the rope waves travel toward your friend, but the rubber band tied around the strap does not come with the waves propagate. If so, the parts of the rope does not come with the waves propagate. So what is propagated by waves? If you ask your friends for a thrilling one end of the rope, you will find something to your friend climbed the wave effect. So, which is propagated by waves of energy. Based on the direction of propagation, wave mechanics can be divided into two types, namely transverse waves and longitudinal waves.

        The sound is a mechanical wave propagation in the direction parallel to the direction of vibration (longitudinal waves). Terms of hearing the sound there are 3 kinds :

              1. There is a sound source

              2. There is a medium (air)

              3. There listener

        Sound properties include :

             • vines require medium

             • It is a longitudinal wave

             • Can be reflected

      There are several kinds of sound characteristics, among others :

            1. The tone is the sound of a regular frequency.

            2. Wheezing is a sound whose frequency is irregular.

            3. Color is a sounds that sound the same but sound different frequency.

            4. Thud sound amplitude is very large and sudden sounds.

    

              The propagation of sound, because the sound is the sound wave has a propagation speed is influenced by two factors :

            1. Particle density of the medium through which the sound. The more tightly the particle 

                composition of the medium, the faster sound propagates, so that the sound propagates fastest 

                in solids.

           2.  Medium temperature, the more heat the temperature of the medium through which the sound 

                propagates faster. This relationship can be formulated into mathematical equations 

                (v = v0 + 0.6.T) 

             where v0 is the propagation of zero-degree temperature and t is the temperature of the medium.

          sound by frequency can be divided into three kinds :

            • infrasound is sound frequencies less than 20 Hz. Creatures that can hear infrasonic sound is 

              crickets.

            • Audiosonik is a sound frequency between 20 Hz to 20 kHz. or sound that can be heard by 

              humans.

            • Ultrasound is sound lebihdari frequency 20 kHz. creatures that can hear ultrasonic are dolphins.