Which of the following statements is true? a. like charges attract and unlike charges repel each other. b. gravitational forces only exist between large masses. c. on a level surface, normal force is greater than the weight of the object. d. applied forces are those created by another object or person.

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

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?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory