Which evidence card could be eliminated because it did not isolate variables? Evidence Card A: Magnetic pole arrangement

Evidence Card B: Number of wire coils

Evidence Card C: Rail material

Evidence Card D: Distance between the car and launcher

None should be eliminated.

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle