Calculate (a) the density of a solid substance if a cube measuring 2.33 cm on one side has a mass of 117 g and (b) the mass of a cube of the same substance measuring 7.41 cm on one side.

For a: The density of a solid substance is

For b: The mass of the cube is 3763.14 grams.

Explanation:

To calculate the volume of cube, we use the formula:

     .....(1)

where,

a = edge length of cube

Edge length of cube = 2.33 cm

Volume of cube =

Mass of cube = 117 g

To calculate density of a substance, we use the equation:

    .....(2)

Putting values in above equation, we get:

Hence, the density of a solid substance is

Edge length of cube = 7.41 cm

Volume of cube =

Density of cube =

To calculate the mass of cube, we use equation 2:

Hence, the mass of the cube is 3763.14 grams.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.