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The nucleus of helium contains:
(1)Four protons
(2)Four neutrons
(3)Two neutrons and two protons
(4)Four protons and two electrons
Ans: (3)Two neutrons and two protons
How to draw hr diagram including life cycle of the sun
Larry's gravitational potential energy is 1870Jas he sits 2.20 m above the ground in a sky diving airplane. What is Larry's gravitational potential energy when he begins to jump fr
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