I find it hard to believe that there could be such a thing, considering that keyholes come in many sizes, and only one master key could open them all up?
F dp/dt where p is momentum m*v. v is not changing, so F v*dm/dt. dm/dt rho*A*dx/dt dm/dt rho*A*v. Therefore F rho*A*v^2 v Q/A where Q volume flow rate and A the nozzle area F rho*Q^2/A rho 10^3 kg/m^3 Q 450*10^-6 / 60 m^3/sec A π*(0.004^2) EDIT: kirchwey is correct. Q should be 450*10^-3/60 7.5*10^-3 m^3/sec, and Q^2 5.63*10^-6. Then F 1119 N
If you only want it temporary then I suggest using Show-card paint it is water soluble and washes of with water. It is the type of paint they use when selling an automobile where they write on the car it self for sale, phone number etc. On side of door or windshield and it comes right off with cold water.
