Select the correct statement about polar bonds and dipole moments. a. A linear diatomic molecule AX has a dipole moment equal to the sum of the electronegativities of A -- X.
b. The dipole moment for a polyatomic molecule equals the vector sum of the individual bond moments.
c. The electrons in a polar covalent bond spend more time near the least electronegative atom in the bond.
d. A polyatomic molecule which contains one or more polar bonds always has a molecular dipole moment.
e. A dipole moment quantifies the separation of charge in a molecule using the number of lone pairs on each atom.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.