Multiple Choice: 4) In which of these cases is positive work being done on the person?
a) The person leans against a wall
b) The person rides on a car around a roundabout at constant speed
c) The person jumps out of an airplane and falls downwards
d) The person pushes a lawnmower around a yard

The softest and hardest minerals are: softest hardest

Pl asaaap ! match the term to the correct description. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. movement that is like a t transfers energy from one location to another 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave

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