The figure above shows three ropes tied together in a knot. one of your friends pulls on a rope with a force of 3 newtons and another pulls on a second rope with a force of 5 newtons. how hard and in what direction must you pull on the third rope to keep the knot from moving?

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

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In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.