Which statement best defines work? a. work is the time it takes to move an object once acted upon by a force. b. work occurs when balanced forces act on an object and cause movement in the direction of these forces. c. work occurs when a force causes motion of an object, and this motion is in the same direction of the applied force. d. work is the distance over time that an object moves once acted on by a force.

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

Where do magnetic lines of force enter earth?