A(n) must be attached to the top end of a conduit riser, where conduit is used in a service installation. a. service entrance head b. bushing c. entrance ell d. lb

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me