Acceleration in a fluid with specific gravity

Click For Summary
SUMMARY

The discussion centers on calculating the acceleration and apparent weight of a 30 kg object with a specific gravity of 3.6 submerged in a fluid with a specific gravity of 1.2. The correct answer is determined to be option D, where the acceleration of the object is 2/3g and its apparent weight is 200N. Participants emphasize the importance of using a free-body diagram and applying Newton's second law to solve for acceleration and apparent weight accurately.

PREREQUISITES
  • Understanding of specific gravity and its implications in fluid mechanics
  • Knowledge of Newton's second law of motion
  • Ability to draw and interpret free-body diagrams
  • Familiarity with the concept of apparent weight in fluid dynamics
NEXT STEPS
  • Study the principles of buoyancy and Archimedes' principle
  • Learn how to calculate forces acting on submerged objects
  • Explore advanced applications of Newton's laws in fluid mechanics
  • Investigate the effects of viscosity on object motion in fluids
USEFUL FOR

Students and professionals in physics, engineering, and fluid dynamics who are looking to deepen their understanding of forces acting on objects in fluids and the calculations involved in determining acceleration and apparent weight.

pkamensky
Messages
3
Reaction score
0
[An object with mass 30 kg and specific gravity 3.6 is placed in a fluid whose specific gravity is 1.2. Neglecting viscosity, which of the following is true?


A. The acceleration of the object is 1\3g and its apparent weight is 100N
B. The acceleration of the object is 2\3g and its apparent weight is 100N
C. The acceleration of the object is 1\3g and its apparent weight is 200N
D. The acceleration of the object is 2\3g and its apparent weight is 200N



I believe the weight is 100N, but do not know the grams or why
 
Physics news on Phys.org
"g" is not grams; it's the acceleration due to gravity. To start this problem, draw a free-body diagram on the mass and label all forces. Write out Newton's second law, then solve for acceleration.

By the way, in case you didn't know, "apparent weight" is just the net external force on the mass.
 

Similar threads

Specific Gravity: Mass 30kg & SG 3.6 in Fluid SG 1.2: True?
  • · Replies 3 ·
Replies
3
Views
2K
High School The Effect of Linear and Rotational Motion on Measured Weight
  • · Replies 10 ·
Replies
10
Views
1K
High School Using energy principles to find equilibrium depth of floating object
  • · Replies 8 ·
Replies
8
Views
1K
Undergrad Apparent Weight problem (falling beam)
  • · Replies 2 ·
Replies
2
Views
2K
High School Why do we feel gravitational acceleration from the Earth and not from the Sun?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Express drag force/acceleration/velocity as function of time
  • · Replies 14 ·
Replies
14
Views
2K
High School Use Surface-Volume to approximate gravity for planets and protons
  • · Replies 6 ·
Replies
6
Views
2K
Specific Gravity, weight and acceleration
  • · Replies 6 ·
Replies
6
Views
12K
Chemistry What is "gauge pressure" and how does a manometer work?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Remark on centrifugal force in Heino Falcke's black hole book
  • · Replies 22 ·
Replies
22
Views
3K