Time For Pictures!!

Hye!! Now I want to share my pictures made by my own.I like to edit any pictures that make me feel want to edit..here are some pictures that I edit by GIMP and Photoscape..hope enjoyy my pictures ;)..sorry if my pictures not cute like your pictures huhuhu

WE LOVE PHYSICS !!

Physics of Sound

Traveling Waves

Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively. Shown in the diagram below is a traveling wave. The shaded bar above it represents the varying pressure of the wave. Lighter areas are low pressure (rarefactions) and darker areas are high pressure (compressions). One wavelength of the wave is highlighted in red. This pattern repeats indefinitely. The wavelength of voice is about one meter long. The wavelength and the speed of the wave determine the pitch, or frequency of the sound. Wavelength, frequency, and speed are related by the equation speed = frequency * wavelength. Since sound travels at 343 meters per second at standard temperature and pressure (STP), speed is a constant. Thus, frequency is determined by speed / wavelength. The longer the wavelength, the lower the pitch. The 'height' of the wave is its amplitude. The amplitude determines how loud a sound will be. Greater amplitude means the sound will be louder.

Interference

When two waves meet, there can be two kinds of interference patterns; constructive and destructive. Constructive inteference is when two waveforms are added together. The peaks add with the peaks, and the troughs add with the troughs, creating a louder sound. Destructive interference occurs when two waves are out of phase (the peaks on one line up with troughs on the other). In this, the peaks cancel out the troughs, creating a diminished waveform. For example, if two waveforms that are exactly the same are added, the amplitude doubles, but when two opposite waveforms are added, they cancel out, leaving silence.

Standing Waves

Vibration inside a tube forms a standing wave. A standing wave is the result of the wave reflecting off the end of the tube (whether closed or open) and interfering with itself. When sound is produced in an instrument by blowing it, only the waves that will fit in the tube resonate, while other frequencies are lost. The longest wave that can fit in the tube is the fundamental, while other waves that fit are overtones. Overtones are multiples of the fundamental. The areas of highest vibration are called antinodes (labeled 'A' on the diagram), while the areas of least vibration are called nodes (labeled 'N' in the diagram). In an open pipe, the ends are antinodes. However, in a pipe closed at one end, the closed end is a node, while the blown end is an antinode. Thus, closed pipes yield only half the harmonics.

Transverse Waves

If a string that is fixed on both ends is bowed or plucked, such as in a violin, vibrations are formed that are in a standing wave pattern, having nodes at the fixed ends, and an antinode in the center. Several harmonics are also produced, in a similar way to the standing wave.

Overtones

Overtones are the other frequencies besides the fundamental that exist in musical instruments. Instruments of different shapes and actions produce different overtones. The overtones combine to form the characteristic sound of the instrument. For example, both the waves below are the same frequency, and therefore the same note. But their overtones are different, and therefore their sounds are different. Note that the violin's jagged waveform produces a sharper sound, while the smooth waveform of the piano produces a purer sound, closer to a sine wave. Click on each wave to hear what it sounds like. Keep in mind that all are playing the same note.

Try It Yourself - Interact With Sound

To help understand how sound works, download MouSing. It's a softwaretheremin: an electronic instrument that allows direct control of pitch and amplitude. By moving your mouse horizontally across the screen, you alter the wavelength of the sound being produced, and thus the pitch (displayed in Hz on the bottom of the program). The higher the frequency, the higher the pitch. By moving the mouse vertically, you alter the volume, or amplitude, of the wave.

WE LOVE PHYSICS!!

ROTATION OF A RIGID BODY 

Hello! Welcome back my readers :) are you enjoy your holiday very much? I hope so.Before I

explain about the topic in physics subject, I want to ask do you like Physics subject? It is your friend or your killer subject? For me, I hate physics subject. I always get D in examination . I am trying so hard to get good result in this subject start form semester 1 because, my real ambition is to be a veterinary. Unfortunately , I got module 2 in matriculation and sadly I have to learn Physics . Physics is so complicated if we do not explore . So, in this year I try my best to get Physics subject is A. Now, I love physics subject very much. I hope this 2 semester, I can get

c and above in UPS. What a long story is it? Okay lets talk about this topic . I want to write about this topic because on Wednesday, I have an urban test .So, I can study this subject through this blog . Lets start our lesson guys!

TORQUE(τ)

Do you know what is torque? If you can see why the door is open and close, how the force exerted when the door is open or close?So this is the aim of torque. When we calculate toque , it become this:

τ = F d
F : magnitude of the force
d : perpendicular distance (moment arm)
where τ : magnitude of the torque

TORQUE ALSO THE PRODUCT OF FORCE,RADIUS AND ANGLE (SIN 0)

*It is a vector quantity.
*The unit of torque is NM,When the object is:

Positive - turning tendency of the force is anticlockwise.

 Negative - turning tendency of the force is clockwise.

ABOUT ME

 Hello there! Welcome to my blog.

    I am very happy because I can post my blog again.

This is my first time I wrote my blog in English and do you know? I  really miss all my friend

who live in the city .I hope they also miss me too. When I come back to my home (city), I realize that I can meet my friends and talk about many topics that we want to talk but unfortunately, I can't meet my friends on account of  I have to go to my mother's village, where my grandfather and my grandmother lives because it's been 10 years I don't meet them so, my mother said "Its time to meet