Fred rides his bicycle 5.1 miles in 21 minutes. what is fred's average speed (in mi/h)?

Why there is no inductive reactance in dc circuits

When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?