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?

If we relied solely on the nonrenewable resources found in the u. s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

What is the coefficient of kinetic friction μk between the block and the tabletop?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.