1. Explain what it means when we say a substance is magnetic. 2. Discuss the relationship between electric and magnetic fields.
3. Which type of wires (copper, aluminum, or string) are ferromagnetic metals?

An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°c. the bubble rises to the surface, which is at a temperature of 20°c. take the temperature of the bubble’s air to be the same as that of the surrounding water. just as the bubble reaches the surface, what is its volume?

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive