A block with mass m = 0.4 kg oscillates with amplitude A = 0.2 m at the end of a spring with force constant k = 12 N/m on a frictionless, horizontal surface. Rank the periods of the following oscillating systems from greatest to smallest. If any periods are equal, show their equality in your ranking.

(a) The system is as described above.(b) The amplitude is changed to 1.6 m.(c) The mass is changed to 1.6 kg.(d) The spring now has a force constant of 30 N/m.(e) A small resistive force is added so the motion is underdamped.

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?