Calculate PSI of Hollow Cube with Hole Opened

  • Thread starter Thread starter daviddjh
  • Start date Start date
  • Tags Tags
    Calculations Psi
AI Thread Summary
To calculate the psi of the hollow cube structure after the hole opens, Boyle's Law (PV=c) can be applied, considering the initial conditions of the cube. The cylinder, which is 14 cm long with a radius of 2 cm, will contain a vacuum after the air is released from the cube. This simplifies the calculations, as the cylinder does not need to account for atmospheric pressure. The change in volume and pressure can be determined using the initial psi of the cube and the volume of the cylinder. Understanding these principles allows for accurate pressure calculations in the modified structure.
daviddjh
Messages
3
Reaction score
0
Suppose you have a hollow cube with a volume of 504c3. The inside of the cube has a psi of 94 and is just air. Now suppose that a hole opened in the bottom of this cube with an area of 12.56cm2 that leads to a hollow cylinder that is 14 cm long with a radius of 2cm. Now how would you go about calculating the psi of this whole structure after the hole is opened, the air is released and the volume has changed.
 
Physics news on Phys.org
Does the cylinder contain air at normal atmospheric pressure, or is it vacuum?
 
Nugatory said:
Does the cylinder contain air at normal atmospheric pressure, or is it vacuum?
The cylinder would have a vacuum inside it
 
daviddjh said:
The cylinder would have a vacuum inside it

OK - that makes it easy. Boyle's Law, ##PV=c## where ##c## is a constant, will get you an answer in short order.

(Boyle's Law would still get you there if the cylinder weren't a vacuum, but it would be more work).
 
Thread ''splain this hydrostatic paradox in tiny words'

Thread ''splain this hydrostatic paradox in tiny words'

This is (ostensibly) not a trick shot or video*. The scale was balanced before any blue water was added. 550mL of blue water was added to the left side. only 60mL of water needed to be added to the right side to re-balance the scale. Apparently, the scale will balance when the height of the two columns is equal. The left side of the scale only feels the weight of the column above the lower "tail" of the funnel (i.e. 60mL). So where does the weight of the remaining (550-60=) 490mL go...
View full post »

Thread 'The Effect of Linear and Rotational Motion on Measured Weight'

Consider an extremely long and perfectly calibrated scale. A car with a mass of 1000 kg is placed on it, and the scale registers this weight accurately. Now, suppose the car begins to move, reaching very high speeds. Neglecting air resistance and rolling friction, if the car attains, for example, a velocity of 500 km/h, will the scale still indicate a weight corresponding to 1000 kg, or will the measured value decrease as a result of the motion? In a second scenario, imagine a person with a...
View full post »

Thread 'Coulomb gauge implies instantaneous radial electric field?'

Scalar and vector potentials in Coulomb gauge Assume Coulomb gauge so that $$\nabla \cdot \mathbf{A}=0.\tag{1}$$ The scalar potential ##\phi## is described by Poisson's equation $$\nabla^2 \phi = -\frac{\rho}{\varepsilon_0}\tag{2}$$ which has the instantaneous general solution given by $$\phi(\mathbf{r},t)=\frac{1}{4\pi\varepsilon_0}\int \frac{\rho(\mathbf{r}',t)}{|\mathbf{r}-\mathbf{r}'|}d^3r'.\tag{3}$$ In Coulomb gauge the vector potential ##\mathbf{A}## is given by...
View full post »

Similar threads

I Time for a cold volume of air to reach a higher air temperature
Replies
11
Views
3K
Time till the air pressure is gone
Replies
8
Views
17K
I Warm-up time for a hollow cylinder
Replies
5
Views
2K
Adiabatic Expansion of Pressurized Air in a Piston-Cylinder Setup
Replies
8
Views
2K
Grav. acc. of object trade-off as vol. increases?
Replies
3
Views
2K
A Predicting how far an object will fly
Replies
1
Views
1K
Pressure drop due to holes in a pipeline?
Replies
10
Views
5K
Air Friction energy loss on a trampoline
Replies
13
Views
2K
I Calculating Cooling Effect in Gas Cylinder Expansion
Replies
3
Views
4K
B Calculations relating to a pneumatic launcher
Replies
12
Views
3K

Hot Threads

Recent Insights

Back
Top