Aproposed ocean thermal-energy conversion (otec) system is a heat engine that would operate between warm water (16°c) at the ocean's surface and cooler water (6°c) 1,300 m below the surface. what is the maximum possible efficiency of the system? enter your answer accurate to two decimal places.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.