A worker is holding a filled gas cylinder Weil which two sentences are true about the energy of the filled gas cylinder 1. It has no energy because it’s being held still.
2. It has gravitational potential energy because of its height.
3. It’s atoms and molecules have thermal energy.
4. It has motion cause it will fall if let go.
5. It’s kinetic energy is being converted to potential energy.

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.