What term is defined as a group of elements or parts that interact to form a complex whole?.

In a good thermo flask the main cause of heat loss is

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?