The velocity of a car changes from 10 m/s east to 30 m/s east in 4 seconds.
what is the acceleration of the car?
a. 5 m/s2 east
b. 5 m/s2 west
c. 10 m/s2 west
d. 10 m/s2 east

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.

At the negative terminal of the battery the electron has electric potential energy. what happens to this energy as the electron jumps from the negative to the positive terminal?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?