I would say some type of polish glue personally from my experience or just use a bubble wrapper when carrying it around

Work is force times distance. If there's no distance, there's no work being done.

When one driver is going faster

The mass of the petcock of the pressure cooker is **0.257 kg.**

The total pressure inside the cooker is= atmospheric pressure+Gauge pressure

=100 kPa+101 kPa=201*10^3 Pa

The area of the petcock is= (π/4)d^2=0.785*0.004^2=12.56*10^(-6) m^2

Now the mass of the petcock is calculated as

P=(F/A)=(mg/A)

201*10^3=(m*9.81/(12.56*10^(-6)

m=0.257 kg

Therefore the mass of the petcock is **0.257 kg**