A toddler is holding a toy with a mass of 1.1 kg when another toddler decides that she wants it. The first toddler pulls horizontally with a
force of 2.5 N and the second toddler pulls horizontally with a force of
3.1 N in the opposite direction. What is the horizontal acceleration of
the toy?

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.