Please help ASAP with the following questions

Chapter i3 homework Conceptual Questions 1} What does it mean to sag.r that two systems are in thermal equilibrium? 2} One method of getn'ng a tight t. 5a",r of a metal peg in a hole in a metal block, is to manufacture the peg slightlyr larger than the hole. The peg is then inserted when at a different temperature than the block. Should the block he hotter or colder man the peg during insertion? Explain your answer. 3} Find out the human population of Earth. Is there a mole of people inhabiting Earth? If the average mass of a person is BID kg. calculate the mass of a mole of people. How does the mass of a mole of people compare with the mass of Earth