You pull a short refrigerator with a constant force f across a greased (frictionless) floor, either with f horizontal (case 1) or with f tilted upward at an angle θ (case 2).
(a) what is the ratio of the refrigerator's speed in case 2 to its speed in case 1 when you pull for a certain time t? give your answer in terms of θ.
vcase 2
vcase 1
=
(b) what is this ratio if you pull for a certain distance d?
vcase 2
vcase 1
=

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?