A "gun" that shoots the vaccine through a narrow opening. No needle is necessary,for the vaccine emerges with

Question

sufficient speed to pass directly into the tissue beneath the skin. The speed is high, because the vaccine (1100 kg/m^3) is held in a reservoir where a high pressure pushes it out. The pressure on the surface of the vaccine in one gun is 4.18*10^6 pa above the atmospheric pressure outside the narrow opening. The dosage is small enough that the vaccine's surface in the reservoir is nearly stationary during an inoculation. The vertical height between the vaccine's surface in the reservoir and the opening can be ignored. Find the speed at which the vaccine emerges.

Please Help!

Answer 1

You have failed to provide two pieces of information that I believe are needed. The volume of the dose and the diameter of the orifice are needed to get the time the pressure force is applied and therefore the velocity achieved.