An electric field around two charged objects is shown. What are the charges of objects X and Y?
A) X: negative
Y: positive
B) X: positive
Y: positive
C) X: negative
Y: negative
D) X: positive
Y: negative

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s