A.) prove that the anti-commutator of any two operators, {a, b} = ab+ ba , is hermitian if the operators are hermitian.
b.) prove that the commutator of any two hermitian operators is anti-hermitian ( anti-hermitian satisfies if \hat{c} = - \hat{c}^\dagger , and hermitian satisfies if \hat{c} = \hat{c}^\dagger ).

Iflow from a warmer object to a cooler object until both objects are the same temperature what am i?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

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?