A 300 gram lead ball with a temperature of 80°C is placed in 300 grams of water at a temperature of 20°C. The specific heat capacity of lead is 16 J/gºC and the specific heat
capacity of water is 4.18 J/gºC. When the system reaches equilibrium what is the equilibrium
temperature?

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?