Which best explains how fiber-optic technology has improved communication?

it has eliminated the need to send audio data through telephones.
it has allowed for faster transmission of internet signals.
it has increased the speed at which light travels through space.
it has reduced society’s reliance on devices such as computers and cell phones.

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?