Tag: physics
Questions Related to physics
A body of density $\rho$ is dropped from rest from a height h into a lake of density $\sigma$, where $\sigma > \rho$. Neglecting all dissipative forces, the maximum depth to which the body sinks before returning to float on surface
A sphere of iron and another of wood, both of same radius are placed on the surface of water. State which of the two will sink? (It is given $\rho _{iron} > \rho _{water}$, and $\rho _{wood} < \rho _{water}$)
How does the density of a substance determine whether a solid piece of density $\rho _s$ of that substance will float or sink in a given liquid of density $\rho _L$?
The dimensions of a wooden raft (density $ =150\ kg/ m^3)$ are $3.0\ m\times 3.0\ m\times 1.0\ m$. What maximum load can it carry in seawater so that the plank just floats in water (density$=1020\ kg/m^3)$?
Two unequal blocks place over each other of different densities ${ \sigma } _{ 1 }$ and ${ \sigma } _{ 2 }$ are immersed in fluid of density of $\sigma$. The block of density ${ \sigma } _{ 1 }$ is fully submerged and the block of density ${ \sigma } _{ 2 }$ is partly submerged so that ratio of there masses is $1/2$ and $\sigma/{ \sigma } _{ 1 }=2$ and $\sigma/{ \sigma } _{ 2 }=0.5$. Find the degree of submergence of the upper block of density ${ \sigma } _{ 2 }$.
Mass (in kg) of the massive object at the centre of the milky way galaxy is of the order.
A galaxy that is moving toward the Earth will show:
Relative to the center of our galaxy:
Who observed galaxies moving away from us?
The red shift in the spectral lines of light reaching us from other galaxies implies that these galaxies: