Calculate the pressure exerted by a girl on the ground if her mass is 50 kg and the area of her shoes in contact with the ground is (a) 150 cm2 (high heels); (b) 400 cm2 (flat
soles). (Take gravitational field strength g= 10 N kg)

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?