What is the height that a book is from the floor if the book contains 195 J of PE and has a mass of 4 kg?

98 ! and brainliest plz ! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?