Gary needs to move a chair that is 20 pounds at a distance of 5 feet. How much work will he need to produce? 100 ft-lbs
80 ft-lbs
120 ft-lbs
75 ft-lbs

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions