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Physics: Principles and ProblemsChapter 11:
Energy and Its ConservationProblem of the Week![](/sites/dl/free/0098458137/193800/ch11_title.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/POWsolutions.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/POWproblem1.gif) (0.0K) | The
power of the nuclear reactor is 190 MW.
The power delivered to the propeller is 43 000 hp. | | ![](/sites/dl/free/0098458137/193800/ch11_answer1a.gif) (0.0K) | | Efficiency
is the ratio of energy output to energy input. | | ![](/sites/dl/free/0098458137/193800/ch11_answer1b.gif) (0.0K) | | ![](/sites/dl/free/0098458137/193800/POWproblem2.gif) (0.0K) | To
determine the energy due to motion, use the kinetic energy equation,
![](/sites/dl/free/0098458137/193800/eq_kineticE.gif) (0.0K):
| | ![](/sites/dl/free/0098458137/193800/ch11_answer2a.gif) (1.0K) | | To
calculate time, use the definition of power, ![](/sites/dl/free/0098458137/193800/eq_power.gif) (0.0K):
| | ![](/sites/dl/free/0098458137/193800/ch11_answer2b.gif) (0.0K) | | Because
the sub takes much longer to accelerate, much of the energy
from the propulsion must go into stirring the water and other
energy drains. | | ![](/sites/dl/free/0098458137/193800/gutter.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/gutter.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/gutter.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/gutter.gif) (0.0K) | ![](/sites/dl/free/0098458137/193800/gutter.gif) (0.0K) |
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