If the object floated in the water how could you find the volume

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

The particles that are found in the nucleus of an atom are