What Is the Minimum Horsepower Required to Prevent a Ship from Sinking?

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SUMMARY

The minimum horsepower required to prevent a leaking ship from sinking is calculated based on the need to pump 12.0 kg of water per second up a height of 1.50 meters. The work done is determined using the formula W = F * d, resulting in 176.4 watts. Converting this to horsepower yields approximately 0.236 horsepower. To accurately compute power, it is essential to use the formula P = W/t, ensuring the mass of water is correctly identified in kilograms.

PREREQUISITES
  • Understanding of basic physics concepts, specifically work and power.
  • Familiarity with the conversion between watts and horsepower.
  • Knowledge of the formula for calculating force (F = mg).
  • Ability to convert units of mass from liters to kilograms.
NEXT STEPS
  • Learn the principles of fluid dynamics related to pumping systems.
  • Study the relationship between work, power, and energy in physics.
  • Explore advanced calculations involving horsepower in mechanical systems.
  • Investigate real-world applications of power calculations in marine engineering.
USEFUL FOR

Students in physics or engineering courses, marine engineers, and anyone involved in ship design and maintenance will benefit from this discussion.

pierra
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Homework Statement



In order to keep a leaking ship from sinking, it is necessary to pump 12.0 of water each second from below deck up a height of 1.50 and over the side.

What is the minimum horsepower motor that can be used to save the ship?

Homework Equations



W=F*d

1 horse power = 746w

The Attempt at a Solution


W=F*d
= mg*d
= (12*9.8)(1.50m)=176.4

176.4w(work) / 746w(horsepower) =0.23646..

p=0.236 hp

I can't see what did I do wrong. help me!
 
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pierra, it looks like you found the Work rather than the power - better to start with a P = formula.
P = W/t = F*d/t would be a terrific start.
Convert the answer to horsepower.
You don't say what units the "12.0 of water" is in and I wonder if that is the trouble with the answer (if it is wrong). You'll need the amount of water in kg to put in for the mass.
 

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