You wish to push a cart across a frictionless surface, so you apply a force of 50 N force for a period of 50.0 seconds. As a result the cart goes from rest to a velocity of 2.3 m/s. What is the
mass? Hint (must find acceleration first.)

Which best represents the law of conservation of mass ?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

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