Alright so a bar of copper has a mass of 200.0 g in air. When it is submerged in water (mass density 1.00 g/cm3) it has a mass of 174.7 g. Now what is the mass density of copper?My second question is. Say someone wants to use a hydraulic jack to raise a car and work on it. (change the oil maybe?). The large piston measures 40.0 cm in diameter and the small piston measures 4.00 cm in diameter.cm in diameter. If the car has a weight of 25970 newtons then what force must beapplied to the small piston to raise the car?
Mass in air 200.0 g, Mass in water 174.7 g The mass of displaced water 25.3 g Volume of displaced water 25.3 cm^3 Volume of the bar 25.3 cm^3 Density of copper mass/volume 7.91 g/cm^3 Hope this helps With regards to 2nd question, dont u just use Fma, but use acceleration due to gravity as (a) As a result of the mass being in newtons, the (ma) part is already done, this the force needed to raise the car is the force downwards, newtons 3rd law !!
Mass in air 200.0 g Mass in water 174.7 g Therefore, the mass of displaced water 200.0 - 174.7 25.3 g Volume of displaced water mass of displaced water/density of displaced water 25.3/1.00 25.3 cm^3 Volume of the bar volume of displaced water 25.3 cm^3 Density of copper mass of copper bar/volume of copper bar 200.0/25.3 g/cm^3 7.91 g/cm^3 Ans: 7.91 g/cm^3 ________________.
