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1
vote
Does a hollow sphere and solid sphere (of same outer radius) have different volumes?
... often a solid object of some material (density) sinks in water while hollow object of the same material stays afloat. If density of both the objects is same, then why does this happen ?
The aver …
2
votes
How to understand the use of infinitesimals in physics, more specifically in engineering tex...
Am I correct in my assessment that this dV is just a "change" from a point (0 volume) to a small amount of volume dV ?
No. … dV is simply the volume of the cube, which is assumed to be small - it does not represent a change from anything to anything. …
2
votes
Accepted
Water and ice, scales
The error in your reasoning in (a) is that since the water exerts a buoyancy force on the ice that is equal to the ice's weight, so by Newton's Third Law the ice must exert an equal and opposite force …
2
votes
How is volume defined and measured in nuclear physics, in particular regarding the Sun’s core?
How is volume defined and measured in nuclear physics, in particular regarding the Sun’s core ? … If you are happy estimating the volume of your bath or your car's fuel tank, the same techniques can be used to estimate the volume of the Sun's core. …
0
votes
How to measure cylinder volume by water weight
The density of water varies with temperature and with salinity. Unless you control these factors very carefully (e.g. always use distilled water at the same temperature) you are unlikely to get a prec …
0
votes
Accepted
Volume in spherical units
Can you explain why he is using (diameter)^3 for volume and not (radius)^3? … In other words, Cavendish's spherical volume unit is \frac {\pi} 6 cubic feet, not \frac {4 \pi} 3 cubic feet. …
9
votes
Am I making a fatal error with this simplification?
The volume (and, indeed, the exact shape) of the tip are irrelevant. …
4
votes
Accepted
Who does all the calculation in Archimedes Principle?
And by measuring the volume of the overflow you are, in effect, counting the water molecules that cannot find a "chair" and are out. And that tells you how many "chairs" the pineapple has taken up. …
2
votes
Accepted
Finding the volume of an irregular object of less density
Or for a more accurate measurement, attach a weight that is heavy enough to pull the object under the water, measure their combined volume, then measure the volume of the weight on its own and subtract … that from the combined volume. …
7
votes
Expansion coefficient for an ideal gas at constant pressure is α = 1/Τ. Explain this relation
In other words
\displaystyle \alpha(T) = \frac 1 T
One way to see this intuitively is to realise that if the absolute change in volume per 1 Kelvin is constant, and volume increases as temperature … rises, then the proportional change in volume per 1 Kelvin must decrease as temperature rises. …
1
vote
How can 1/V be equal to 0 in Boyle's Law?
How can 1/V ever equal zero?
Physically, it can't. This is just a point on a line - it does not have to correspond to an actual physical situation. It is like saying the average family has 2.3 c …
1
vote
Pressure Exerted by Piston on Gas
Your lab booklet is calculating the work done on the gas, whereas you are trying to calculate the work done on the piston. The pressure of the gas is not part of the calculation of the work done on th …
3
votes
Black hole mass
The mass of a black hole can be determined in the same way as we determine the mass of any other astronomical object - by observing how it deflects the paths of other objects that pass close to it. Th …