A roller coaster ride includes a circular loop-the-loop. The roller coaster carriage enters the bottom of the loop at 25m/s. The loop has a diameter of 30mThe carriage is free-wheeling along the track meaning that it is not being driven by a motor. What is the speed of the carriage at the top of the loop?

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?