Explain what is density?
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Explain the Heat Engines ?
Why does a heavy stone nor break a glass place when place slowly on it, while a small stone falling from a great height easily breaks it ?
State the laws of thermodynamics.
The throbbing caused by sounds of slightly different frequencies that results because of periodic constructive and destructive interference is called:
Explain when is fluorescence strong?
Why does oil rise up the wick of the capillary ?
What is the loudness?
Why dies a boat-man push the bank with an oar, when he wants to clear his boat off the bank?
What is the longest lasting synthetic periodic element?
Explain what is the difference between diffraction and interference?
Do radio-waves go in straight line ?
What is the advantage of fixed pulley?