What are the equipments needed to determine the density of a liquid in laboratory ?​

The fact that the total amount of energy in a system remains constant is a(n)

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using deductive reasoning inductive reasoning abductive reasoning subjective reasoning

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes or no?