corpo de massa m=2kg é puxado horizontalmente sobre uma mesa por uma força de intensidade 20N. O coeficiente de atrito entre o corpo e a mesa é µ=0,25. Determine a aceleração do corpo.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Avoltaic cell converts chemical energy to

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?