Tension in lifting cable

  • Thread starter kiwikahuna
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  • #1
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Homework Statement



A seagoing crane lifts a sealed safe from a sunken ship. The average density of the safe is 5.3 grams/cc and its mass is 120 kg. What is the tension in the lifting cable when the safe is still submerged?

Homework Equations



Pressure = density *gravity* height*
Buoyant force = mg

The Attempt at a Solution



I calculated 5300kg/m^2 * 9.81 m/s^2 * 120 kg

The above is what I got so far but I'm not sure I'm doing it right. Any help would be greatly appreciated.
 

Answers and Replies

  • #2
Draw a free-body diagram of the object. From the context of the problem, there must be no net force acting on the object. What forces act in which directions?

Note: the buoyant force is equal to the weight of the DISPLACED fluid, not necessarily equal to the weight of the submerged object.
 

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