Sphere sits at bottom of milk container, find mass?

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SUMMARY

The problem involves calculating the mass of a glass ball with a radius of 2.40 cm submerged in milk with a density of 1.03 g/cm³. The normal force acting on the ball from the container's bottom is 7.50 x 10^-2 N. The relationship between the forces acting on the ball includes the buoyant force and the gravitational force, leading to the equation Fb + 7.5 x 10^-2 N = Mball * g. The solution requires determining the buoyant force using the volume of the ball and the density of the milk.

PREREQUISITES
  • Understanding of buoyant force and Archimedes' principle
  • Knowledge of density calculations (d = M/V)
  • Familiarity with gravitational force equations (Fb = Mf * g)
  • Basic geometry for volume calculation of a sphere (V = 4/3πr³)
NEXT STEPS
  • Calculate the volume of the glass ball using the formula V = 4/3πr³
  • Determine the buoyant force acting on the ball using the density of milk
  • Apply the equation Fb + 7.5 x 10^-2 N = Mball * g to find the mass of the ball
  • Review concepts of fluid mechanics related to forces in fluids
USEFUL FOR

Students studying physics, particularly those focusing on fluid mechanics and buoyancy, as well as educators looking for practical examples of these concepts in action.

tigers4
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Homework Statement


A glass ball of radius 2.40 cm sits at the bottom of a container of milk that has a density of 1.03 g/cm3. The normal force on the ball from the container's lower surface has magnitude 7.50 *10^-2 N. What is the mass of the ball?


Homework Equations


Fb=Mf*g
d=M/V
4/3pir^3=V



The Attempt at a Solution


Fb+(7.5*10^-2)=Mball*g
but it says I am wrong
 
Physics news on Phys.org
They are probably looking for a numeric solution.

The given normal force should be equal in magnitude to 'net weight' of the glass ball in the fluid, which in turn will equal the force due to gravity on the ball less the buoyant force.
 

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