A 73.0 kg father and his 45.0 kg son are sitting on opposite sides of a 4.00m seesaw at the playground. the pivot point is fixed at the midpoint of the board. where must the father position himself to horizontally balance the seesaw if his son sits at the end of the board?

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?

With which of the following is the weak nuclear force associated? a. lightingb. nuclear decayc. ocean tidesd. stactic cling

10 application of ultra sound waves?