All mass movements on earth, landslides, slumps, creep, and avalanches for example, are caused by what action force?
a) gravity
b) inertia
c) friction
d) centripetal force

In a closed system, the total energy prior to an energy transformation is the total energy after. a. equal to b. unrelated to c. greater than d. less than

(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

If forces acting on an object are unbalanced. true or false