Because PE is proportional to the height of where the mass is, and the top of the swing is the highest the mass of the 'bob' ever gets.
The answer to this question would be: <span>D. Magnesium
The </span><span>number of energy levels of aluminum is 3 which was why it was put on the 3rd row. The valence of calcium is 2 which is why it was put in the 2nd column. If you look at the periodic table, the answer should be clear that it was magnesium.</span>
Your answer is true. Covalent bonds are bonds between two atoms, and those two atoms share electrons.
Answer: The definition of an endothermic reaction is that the products have higher energy than the reactants, resulting in a positive enthalpy of reaction.
Explanation:
