How far a cube sinks below the waterlevel

  • Thread starter Thread starter justinram22
  • Start date Start date
  • Tags Tags
    Cube
AI Thread Summary
The discussion revolves around a physics problem involving a wood cube with a density of 700 kg/m^3 floating in water. For part (a), the user successfully calculates the distance from the top of the cube to the water surface but struggles with part (b), which requires determining the mass needed to make the cube's top level with the water. The user attempts to apply the buoyancy equation but arrives at an incorrect mass of 27 kg, while the solution in the textbook states 8.9 kg. Additionally, the user inquires about the weight of a cube of water with the same dimensions, indicating confusion about the calculations. The thread highlights common challenges in understanding buoyancy and density in physics problems.
justinram22
Messages
3
Reaction score
0

Homework Statement


A wood cube .30m on each side has a density of 700 kg/m^3 and floats levelly in water. (a) What is the distance from the top of the wood to the water surface? (b) What mass has to be placed on top of the wood so that its top is just at the water level.


Homework Equations


I assume the buoyancy equation.


The Attempt at a Solution


I figured out part (a) no problem, but seem to be having difficulty with part (b).

I assume it has to be:
Density=(mass/volume)?
When i do that I get 18.9, where the back of the book says 8.9

Thanks guys so much! Hope once I actually get good at physics I can come back and help people similar to myself!
 
Physics news on Phys.org
How much would the wooden block weigh if its density was the same as the density of water?
 
Sorry, but I'm still lost?

So

1000=(mass/.027)
mass=27?

Thanks!
 
27 what?
 
27kg

Which is not what they had in the back of the book (they had 8.9).

Thanks You again!
 
How much does a cube of water weigh which is 0.30 m on each side?
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Buoyancy: Cube of Iron - solved this correctly?
Replies
1
Views
3K
Calculating Buoyancy Force & Length of Submerged Cube
Replies
11
Views
2K
Calculate the Mass of Ice cubes needed to cool a soft drink
Replies
10
Views
3K
Wooden Cube submerged length and the carry limit
Replies
4
Views
1K
Find the fractional increase in inertial mass when an ice cube melts
Replies
10
Views
2K
Multiple choice buoyancy problem
Replies
6
Views
2K
Buoyant Force and Archimedes' Principle
Replies
13
Views
3K
Finding the Density of a Floating Cube
Replies
8
Views
2K
How to Calculate Water Pressure on a Floating Cube?
Replies
4
Views
3K
Force on the bottom of the vessel containing a submerged cube
Replies
30
Views
3K

Hot Threads

Recent Insights

Back
Top