QUESTION 1 Millikan and Harvey set out to measure- A. the diameter of oil droplets under an electric force.
B. the value of the elementary charge.
C. the force of gravity on oil.
D. O the viscosity of air at various temperatures.

(its a multiple choice, but only ones right.)

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

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.