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.

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

What are similarities and differences of reflection, refraction, diffraction and absorption?

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy