se colocan 200gr de agua a 20°c en el congelador de una heladera y se consiguen cubitos de hielo a -8°c ¿que cantidad de calor cedio el agua?

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2