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Answers by Heng X.

Light is transverse electromagnetic wave. Transverse means that the oscillation of energy is perpendicular to the direction of light.    Mathematically, there can be unlimited amount of directions in a space that are all perpendicular to a given line. In reality, this is the case...

Corry,   the common factor for both are (t-u), we can take it out:   (t-u)(s^2-9t^2)   And because a^2-b^2=(a+b)(a-b), in this case,    s^2-9t^2 =s^2-(3t)^2   [note: s=a, 3t=b in the above formula] =(s+3t)(s-3t)   So...

Daisy,   Law of Sine states: Sin(A)/a=Sin(B)/b=Sin(C)/c   In 1, you have A, a and c, you should be able to solve C by Sin(A)/a=Sin(C)/c, from C and A+B+C=180, you should also have B, then use the law of Sine again, you can have b.   For 2, it is the...

Nadia,   Logically, you look at who Gauchos are, what are their traditional cultures, maybe their history etc. Then you take another look at the current Argentinian society, look for similarities between them and the Gauchos. There are quite a few, depending on your perspectives.    It...

The reason people forget math afterwards, sometimes is because the logic is complicated. My solution to that is to break it down to pieces that you do remember. You said you worked hard and understood math. Before you take a break, while you still understand, pause and summarize your understanding...

I will give it a try: Microwave hotspots are caused by standing waves in the field, which is half-wavelength apart. In this case, the distance is 4 cm, i.e. wavelength=8 cm. speed of light in this case: c=wavelength*frequency=8 cm*300 MHz=2.4E+7 m/s If the frequency is fixed 300...

Essense of decimal is still fraction: 3.14=3+1/10+4/100. It is a way to represent a fraction by a set of common denominators: 1/10, 1/100... The advantage of decimals is that because all of them are in common denominators already, addition, subtraction and comparing are quite straightforward...