When will the falling bowling ball have an equal amount of potential energy and kinetic energy? PLEASE ANSWER QUICK!

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.