Find Equilibrium Readings of Scale: Beaker & Oil + Iron Block

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Homework Help Overview

The problem involves a beaker containing oil and a submerged iron block, with the goal of determining the equilibrium readings of a scale measuring the beaker and oil, as well as a spring scale measuring the iron block. The subject area includes fluid mechanics and forces acting in equilibrium.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the weight of the beaker and oil, noting a specific weight value but expressing uncertainty about the contribution of the submerged iron block. Some participants question the relationship between buoyant force and the forces acting on the scales.

Discussion Status

The discussion is ongoing, with participants seeking clarification on how to approach the problem. A hint has been provided regarding the reaction force related to buoyancy, but there is no explicit consensus on the method to calculate the readings on both scales.

Contextual Notes

The original poster is working on this problem with their daughter, indicating a collaborative learning environment. There may be constraints related to the level of understanding and the need for guidance in solving the problem.

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A 1-kg beaker containing 2 kg of oil(density = 916 kg/m^3) rests on a scale. A 2kg block of iron is suspended from a spring scale and completely submerged in the oil. Find the equilibruim readings of both scales.

For the bottom scale, I can find the weight, 29.4 N of the beaker and oil, but I'm not sure how to calculate how much weight the iron block contributes. I know buoyancy force = p*V*g but how would affect the weight on the scale?
 
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HINT: If the liquid pushes up (buoyant force) on the iron what is the reaction force acting on the liquid?
 
any more help? I am working with my daughter trying to solve this.
 
So one more cry for help. How do I calculate the reading on the lower and upper scale given what I know in the problem stated above?

Thanks!
 

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