Pressure on Bottom of Test Tube: 71.442 Pa

  • Thread starter Thread starter jefgreen
  • Start date Start date
  • Tags Tags
    Pressure
AI Thread Summary
The discussion centers on calculating the pressure at the bottom of a test tube containing 2.5 cm of oil and 6.5 cm of water. The relevant formula used is P = Dhg, where D is the density, h is the height of the fluid column, and g is the acceleration due to gravity. The calculation performed yields a pressure of 71.442 Pa. The accuracy of this result is questioned, but no further corrections or alternative calculations are provided. The final answer remains confirmed as correct at 71.442 Pa.
jefgreen
Messages
78
Reaction score
0

Homework Statement


A test tube standing vertically in a test-tube rack contains 2.5cm of oil (Density=0.81 g/cm^3) and 6.5cm of water. What is the pressure on the bottom of the test tube?


Homework Equations


P=F/A

P=Dhg where d=density, h=heigh, and g=gravity.


The Attempt at a Solution



P=(0.81)(9cm {2.5cm+6.5cm})(9.80)

P=71.442 Pa


Is this correct?
 
Physics news on Phys.org
bump.
 
bump again.
 
bump bump
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculating Gauge Pressure at the Bottom of a Test Tube
Replies
5
Views
8K
Finding pressure due to a fluid
Replies
1
Views
4K
Pressure at the bottom of a container containing two liquids
Replies
6
Views
5K
Pressure in a Fluid-Filled Glass with a Side-Hole Tube: Is Pa = Pb = Pc?
Replies
1
Views
2K
Finding the gauge pressure at the bottom of a barrel
Replies
4
Views
3K
Hydrostatic pressure in a tilted tube
Replies
6
Views
3K
Pressure at the bottom of a cube immersed in two liquids
Replies
5
Views
2K
Calculate the height of a water column and expressions for P
Replies
16
Views
6K
Water Pressure Homework Problem
Replies
2
Views
2K
Finding pressure of gas in u shaped tube with liquid
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top