Which of the following expresses Newton's third law? a. The total momentum of an isolated system always remain constant.
b. Acceleration is always accompanied by a force.
c. Every action force is accompanied by an equal and opposite reaction force.
d. Objects tend to remain at rest or in motion at constant speed

When a neutral charge, comes into contact with a positive charge they repel each other nothing happens the neutral charge becomes negative they attract each other

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.