Which of the following statements about current are true? (i) In metal wires, it is the negative charges (Le, the electrons) that move in response to an applied voltage. (ii) By historic convention, circuit diagrams are drawn showing the direction of a "conventional current' as if it were positive charges that move (even though they do not).(iii) The "conventional current" runs in the opposite direction to the actual motion of the electrons. a. Only statement (ii) is true. b.Only statements (i) and (lil) are true. c.Only statement (i) is true. d.All three statements are true.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

The dot diagram represents the motion of the motorcycle as it moves from left to right