Block is lowered into water, what is weight of water spilled?

AI Thread Summary
A 400 cm^3 block of aluminum with a density of 2.7 g/cm^3 displaces an equal volume of water when submerged. The mass of the displaced water is 400 g, which converts to 0.4 kg. Using the weight formula (w=mg), the weight of the spilled water is calculated to be 4N. Some participants initially miscalculated the weight, with one stating 10.8 N. The correct understanding is that the volume of water displaced directly corresponds to the volume of the block.
test2morrow
Messages
15
Reaction score
0

Homework Statement



A 400 cm^3 block of aluminum (D=2.7 g/cm^3) is lowered into a completely full beaker of water. What is weight of water that spills out of the beaker? Correct answer is 4N.

Homework Equations



D=m/v



The Attempt at a Solution



I figured out the volume of the block which will equal to the amount of water displaced...and I did not get 4N.
 
Physics news on Phys.org
What did you get?
 
I got 10.8 N

I figured out the mass (not volume as previously stated) and used w=mg
 
test2morrow said:

Homework Statement


A 400 cm^3 block of aluminum (D=2.7 g/cm^3) is lowered into a completely full beaker of water. What is weight of water that spills out of the beaker? Correct answer is 4N.
/QUOTE]

When 400 cm^3 block of aluminum is completely lowered in the water, 400 cm^3 of water is spilled out. Its mass is 400 g or 0.4 kg. Find the weight of this water.
 
thanks, that helped. my brain just isn't working today.
 

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 '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

Finding the weight of an object submerged in water
Replies
17
Views
4K
Balance reading when new object immersed in water
Replies
20
Views
4K
Finding the density of a block in two layers of liquids
Replies
6
Views
2K
Depth of a basketball floating on water
Replies
9
Views
865
Does Throwing an Object Overboard Affect Pond Water Level?
Replies
2
Views
2K
Block hanging from cord submerged in water, find density
Replies
23
Views
4K
Buoyancy force when a ramp is under water
Replies
15
Views
2K
Calculating the Density and Buoyant Force of a Pear in Water with Added Salt
Replies
4
Views
2K
Weight of water with objects floating
Replies
13
Views
4K
Aluminium weight buoyancy problem
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top