Why do we say that sliding a book to a halt across the table is an “irreversible” process?

Why do we say that sliding a book to a halt across the table is an “irreversible” process? A. Because you can never slide the book back again B. Because energy is destroyed in this process C. Because the book will never return to motion on its own D. Because the momentum of the book is transferred to the table E. Because of conservation of angular momentum If the laws of nature (conservation of energy etc.) allow several possible outcomes, which is the most likely to occur? A. The outcome with the most momentum B. All outcomes are equally likely C. The outcome with the smallest energy D. The outcome with the largest energy E. The outcome with the least total momentum If you have two atoms rattling around in a box, what is the chance that, at any moment, you would find both on the same side? A. 0.1 B. 0.25 C. 0.35 D. 0.50 E. 0.75 Does the principle of “equipartition of energy” mean that every atom in a gas has the same amount of energy at a particular instant? A. yes B. no