5. The equation of motion of a spring-mass-damper system is given by +3+9x=10sin (5t) dx dx dt dt The damping factor for the system is (A) 2 (B) 0.25 (C) 0.5 (D) 3 6. Which one of the following statements about a phase diagram is INCORRECT? (A) Solid solubility limits are depicted by it (B) It indicates the temperature at which different phases start to melt (C) It gives information on transformation rates (D) Relative amount of different phases can be found under given equilibrium conditions 7. A closed vessel contains pure water, in thermal equilibrium with its vapour at 25C (Stage #1), as shown. Not to scale Valve A Water vapour Water Ambient air Isothermal oven at 80C Valve A 25C at 25C, 1 atm Air at 80C, 1 atm The vessel in this stage is then kept inside an isothermal oven which is having an atmosphere of hot air maintained at 80C. The vessel exchanges heat with the oven atmosphere and attains a new thermal equilibrium (Stage #2). If the Valve A is now opened inside the oven, what will happen immediately after opening the valve? (A) Water vapor inside the vessel will come out of the Valve A (B) Hot air will go inside the vessel through Valve A (C) All the vapor inside the vessel will immediately condense (D) Nothing will happen - the vessel will continue to remain in equilibrium