A swimmer whose body’s surface area is approximately 1.6 m2 lies at a depth of 3 m below the water surface. How much force is exerted on his body due to water pressure.

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.