Carlos uses a machine to decrease his force. Which of the following statements is true? His machine must decrease the distance the object moves.
His machine must increase the distance the object moves.
His total amount of work has decreased.

When you turn on a battery-operated device, an electrical circuit is

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.