Mary is driving a car of mass 900 kilograms toward the north with a velocity of
22 meters/second. danny is driving his 900–kilogram car with a velocity of
15 meters/second toward the east. they collide and both cars move together afterwards. what is the magnitude of the resultant momentum of the cars after the collision?

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?