What Force is Necessary to Submerge Mary in Fresh Water?

Click For Summary
SUMMARY

The discussion centers on calculating the force necessary to submerge an individual named Mary in fresh water, given her specific gravity of 0.95 and weight of 660 N. The calculation involves using the formula for buoyant force, F = ρgV, where ρ represents the density of the fluid, g is the acceleration due to gravity, and V is the volume of the displaced fluid. The derived force of buoyancy is approximately 63.94 Newtons, indicating that this is the force required to just barely submerge Mary.

PREREQUISITES
  • Understanding of specific gravity and its implications in fluid mechanics
  • Familiarity with the formula for buoyant force (F = ρgV)
  • Basic knowledge of physics concepts such as weight and mass
  • Comprehension of the relationship between density, volume, and buoyancy
NEXT STEPS
  • Study the principles of buoyancy in fluid mechanics
  • Learn how to calculate specific gravity and its applications
  • Explore the effects of varying fluid densities on buoyant force
  • Investigate real-world applications of buoyancy in engineering and design
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding fluid mechanics and buoyancy principles.

coopertown
Messages
1
Reaction score
0
What force is necessary to just barely submerge (push Mary under fresh water) Mary if her average specific gravity is 0.95 after taking a deep breath and her weight in air is 660 N?


F=mg ; Force of buoyancy=ρgV;



F=mg
660/9.8=mass of air
mass of air=67.3
force of buoyancy= 67.3 x 0.95
=63.94 Newtons

is this right?! i am panicking! physics is so hard omg. fluids are so difficult to understand! waaaaaaaaa
 
Physics news on Phys.org


Do not panic! You have the formula for the buoyant force

Force of buoyancy=ρgV.

What do ρ, g, V mean?

ehild
 

Similar threads

Determine Force on 6ft Door Due to Water & Air Pressure
  • · Replies 7 ·
Replies
7
Views
2K
What is the Apparent Weight of an Iron Block Submerged in Water?
  • · Replies 6 ·
Replies
6
Views
6K
What Does an Electronic Balance Measure in Water Experiments?
  • · Replies 12 ·
Replies
12
Views
2K
If you submerge a 3cm cube of ice in cup of water, with what force
  • · Replies 1 ·
Replies
1
Views
2K
How Hot Must the Air in a Balloon Be to Lift a Given Mass?
  • · Replies 7 ·
Replies
7
Views
4K
How Much Fresh Water Is Needed to Submerge a Submarine in Salt Water?
  • · Replies 1 ·
Replies
1
Views
5K
Object Weight given only difference in weights in and out of water
  • · Replies 7 ·
Replies
7
Views
10K
Buoyancy-Volumne & Specific Weight of Submerged Mass
  • · Replies 2 ·
Replies
2
Views
2K
What is the density of the life preserver?
  • · Replies 2 ·
Replies
2
Views
4K
How Is the Mass of the Spherical Weight Calculated for Buoyancy Equilibrium?
  • · Replies 4 ·
Replies
4
Views
3K