If you want to hang a picture frame that has a force due to gravity of 20N, what does the tension in the cable have to be to prevent it from falling?

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explanation:

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

radiation

explanation:

heat is transmitted by radiation