14 Select the correct answer.
Which particles make up the nucleus of an atom?
O A.
protons and electrons
OB.
neutrons and electrons
OC.
protons only
OD.
protons and neutrons
OE.
neutrons only
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Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?