Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work? move the machine to a different gravitational field. increase the friction between its moving parts. reduce the friction between its moving parts. redefine the machine’s system boundaries.

Most of the volume of an atom is occupied by the

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

What was the first instrument to ever record an earthquake?