The two pendulums shown in the figure below, each consist of a uniform solid ball of mass M supported by a rigid massless rod, but the ball for pendulum A is very tiny while the ball for pendulum B is much larger having a non-negligible radius R = 1.15 m. The length L in the figure is L = 1.6 m. Find the ratio of the ratio TB/TA of the period of pendulum B to the period of pendulum A.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

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?