Which statement is true? a. a resistor alters current and a switch turns current on and off b. a resistor measures voltage, and a switch changes ac to dc or dc to ac c. a resistor alters current and a switch measures voltage d. a resistor changes ac to dc or dc to ac, and a switch turns current on and off

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.

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

What happens to an isotope during radioactive decay?