Aquantity of air undergoes a cycle consisting of the following internally reversible processes in a closed system. process 1-2: constant-volume heating from an initial state at pi 0.1 mpa, ti - 27 °c, and v1 0.02 m3 to p2 0.4 mpa process 2-3: constant-pressure cooling process 3-1: isothermal heating to initial state employing the ideal gas model with variable specific heats, find (a) entropy change in each process of the cycle, (b) heat and work involved in each process of the cycle, (c) is this cycle a power cycle or refrigeration cycle?

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?