- #1
SataSata
- 39
- 2
Homework Statement
I place a water filled beaker on an electronic balance and zero the reading. Meaning the balance will not be measuring the weight of the water and the beaker.
a.) If a ball is resting at the bottom of the beaker. What would the balance be measuring?
b.) If I immersed and suspend a ball with a string in the water and not touching any sides. What will the electronic balance be measuring?
c.) This time I lift the ball up from below, but not getting it out of the water. What would the balance be measuring?
Homework Equations
The Attempt at a Solution
a.) Looking at the free body diagram, I guess the balance shows the normal force. Since N = mg - B where B is buoyancy.
b.) Since it is suspended, T + B = mg whereby T is tension. It is in equilibrium so what would the balance be measuring? Is it the mass of the displaced water according to Archimedes Principle? If it is so, does part a include the mass of the displaced water too?
c.) When I lift the ball up, fluid resistance f is pushing it down. Hence F = T + B - mg - f. The resultant force is upwards, but what is the balance measuring?