Explain why the light bulb isn't lighting up in the circuit
pictured on the right.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?