8. Este mult mai usor sa distingem prin pipait o carpa umezita cu apa de una manjita cu ulei. De ce? 9. Aveti pe aragaz o oala cu apa pusa la incalzit. In interiorul ei, pe un suport de metal, introduceti o oala mai mica in care turnati apa. Apa din oala cea mare se ridica pana la un anumit nivel dar nu patrunde in oala cea mica. Incalziti pana ce apa din oala cea mare incepe sa fiarba si continuatiincalzirea. Va fiebe la un moment dat si apa din oala cea mica?
10. Intr-un vas puneti apa care a fost in prealabil fiarta. In acest vas pluteste un al doilea vas, mai mic, care contine apa nefiarta. Incalziti pe aragaz si observati ca apa din vasul mic fierbe mai devreme decat apa din vasul mare. De ce? Daca aruncam in apa din vasul mare cateva frunze de ceai, vom observa ca apa din vasul mic nu mai fierbe. De ce?

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

Asystematic approach to problem solving is called a (an)

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0