Example 4.4 A density bottle holds 250 g of liquid at 30°C and
only 248.5 g at 60°C. Find
the apparent and
6. the real cubic expansivity of the liquid, if the
linear expansivity of the material of the bottle
is de = 0.000006 K-1
a​

Explanation:

Using apparent = mass of liquid expelled/mass of liquid remaining × temp. rise

Mass expelled: 250-248.5=1.5g

Mass remaining =248.5g

Temp. rise= 60-30= 30ºc

= 1.5/248.5×30=0.0002012

Using real= apparent + cubic expansivty

Cubic= 3 × linear expansivty

= 3×0.000006=0.000018

0.0002012+0.000018=0.0002192

car a and b are moving in opposite directions

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1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//