What comprises a comet?

If two equipotent planes differ in potential by 1.0 volt, and the electric field between them is 20 N/C, what is the separation of the planes?

A. 20 cm B. 0.050 cm C. 5.0 cm D. 2.0 cm E. 4.0 cm

Under which of the following conditions is the magnitude of the average velocity of a particle moving in one dimension smaller than the average speed over the time interval?

1.A particle moves in the +x direction and then reverses the direction of its motion. 2.A particle moves in the -x direction without reversing. 3.There are no conditions for which this is true. 4.A particle moves in the +x direction without reversing.

If a doubly-ionized oxygen atom is accelerated from rest by going through a potential difference of 10 V, what will be the change in its kinetic energy?

a. 10 eV c. 20 eV b. 40 eV d. none of the above

Saturn's rings are thick, perhaps a few thousand kilometers

Indicate whether the statement is true or false