You are out camping. As it gets dark, it starts to get cold so you light a fire. What are two energy transformations that explain the light and the heat given off by the fire?

Which accounts for an increase in the temperature of a gas that is kept a constant volume

What happens when a rubber rod is rubbed with a piece of fur?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?