What kind of error would result if you read the liquid volume where the liquid touches the wall of the cylinder rather than at the meniscus

What is the final velocity of the initial velocity of 25 and -50?

Which best represents the law of conservation of mass ?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.