Tension in and out of water in constant velocity

Click For Summary
SUMMARY

The discussion focuses on calculating the tension in a crane's cable while lifting an 18,000-kg steel hull of a ship at constant velocity. When the hull is submerged in water, the tension is influenced by the buoyant force acting on it, which must be accounted for in the calculation. The tension when the hull is completely out of the water equals the weight of the hull, which is 18,000 kg multiplied by the acceleration due to gravity (9.81 m/s²), resulting in a tension of 176,580 N. The confusion arises from the need to consider water displacement when submerged, which affects the net force acting on the hull.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of buoyancy and Archimedes' principle
  • Familiarity with basic physics formulas for weight and tension
  • Ability to perform calculations involving forces and displacements
NEXT STEPS
  • Study the principles of buoyancy and Archimedes' principle in detail
  • Learn how to calculate tension in cables under varying conditions
  • Explore the concept of water displacement and its effects on submerged objects
  • Review examples of constant velocity motion in physics
USEFUL FOR

Physics students, engineers, and anyone involved in mechanics or fluid dynamics who seeks to understand the forces acting on submerged objects and their implications in real-world applications.

pearson.hannah
Messages
3
Reaction score
0
A crane lifts the 18,000-kg steel hull of a ship out of the water at constant velocity.

(A) Determine the tension in the crane’s cable when the hull is submerged in the water.

(B) Find the tension when the hull is completely out of the water.

I would have thought that B would just be the weight, but apparently that was wrong. And how do you find the amount of water displaced when the hull is submerged? I was thinking maybe A is the weight minus the displacement?

Thanks in advance for any help!
 
Physics news on Phys.org
Your answer to B looks right to me. What's your reason for saying it's wrong?
I agree with your answer to A too.
 

Similar threads

Buoyancy of ship, volume displaced, and tension of crane (in/out) of water
  • · Replies 2 ·
Replies
2
Views
21K
Problem involving space elevators
  • · Replies 19 ·
Replies
19
Views
2K
Simple mechanics question: will reading of the scale change?
  • · Replies 5 ·
Replies
5
Views
2K
Rocket + Connected Body Dynamics problem
  • · Replies 47 ·
2
Replies
47
Views
3K
Pulling a submerged car wreck out of the water
  • · Replies 7 ·
Replies
7
Views
3K
Collisions, Impulses and Impulsive Tension
  • · Replies 17 ·
Replies
17
Views
5K
Finding the tension of two cables holding an object at rest
  • · Replies 7 ·
Replies
7
Views
3K
Find the initial velocity of a water rocket (mass changes)
  • · Replies 8 ·
Replies
8
Views
3K
Tension between two objects moving at constant velocity
  • · Replies 3 ·
Replies
3
Views
5K
Why must a water skier at constant velocity lean back?
  • · Replies 13 ·
Replies
13
Views
5K