Hi there! I can help!
What grade of physics?
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he speed of sound can travel faster in hot air than it can in cold air.
Newton's second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.
The glass rod losses electrons because the silk cloth has a positive charge so it attracts the negative charge of the glass rod. :)