For mathematics and physics help see Mathematics and physics help on Fiverr I have a BSc from UNISA (graduated 1982).
2) Daily hint 27 June 2015. A 70 kg man is standing still on a rough floor. What is the resultant force on the man? Answer: Because the man is not accelerating we know that the sum of all forces (resultant force) acting on the man is zero. There is the gravitational force downwards and the force of the floor upwards. Their vector sum is zero. Note that F=ma says that the sum of all forces acting on a body equals the mass of the body times the acceleration of that body.
1) Daily hint 26 June 2015:
F = (kq1q2)/r2
Above is the mathematical statement. In words: The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
The constant k is always the same from problem to problem. It is called Coulomb's constant or called the electric force constant or electrostatic constant.
If you had to make r the subject of the formula how would you go about it? You could multiply both sides by r2 and then divide both sides by F and then take the square root of both sides (or multiply both sides by r2/F and take the square root of both sides).
