The ocean thermal electric conversion system (otec) is an example of a high-tech electric generator. it takes advantage of the fact that in the tropics, deep ocean water is at a temperature of 4 c, while the surface is at a temperature around 25 c. the idea is to find a material that boils between these temperatures. the material in the fluid form is brought up through a large pipe from the depths, and the expansion associated with its boiling is used to drive an electrical turbine.

the gas is then pumped back to the depths, where is condenses back into a liquid and the whole process repeats.

what is the maximum efficiency with which otec can produce electricity?

1. 1.3%
2. 7.6%
3. 84%
4. 7.0%
5. 93%

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.