Arock of mass 0.24 kg falls from rest from a height of 20 m into a pail containing 0.40 kg of water. the rock and water have the same initial temperature. the specific heat capacity of the rock is 1850 j/(kg · c°). ignore the heat absorbed by the pail itself, and determine the rise in the temperature of the rock and water.

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?