Type 1 to 2 paragraphs describing the changes in potential, kinetic, and thermal energy of the cart at each of the four positions along the track. Be sure to define your system. Also include the positions of the cart where are each form of energy is at its maximum and minimum values.

Why do astronauts in the space shuttle weigh less?

Does heating a metal wire increase or decrease its electrical resistance? why?

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?