Question

A sample of an unknown material appears to weigh 300 N in air and 222 N when totally immersed in alcohol. What are (a) the volume and (b) the density of the material? (c) What material is it?

The Universal constant R=8.31J/mol K

The absolute temperature T (Kevin) = T_c +273.15

The atmospheric pressure=1atm=1.013*10⁵Pa.

The density of alcohol=700kg/m³.

The density of aluminum=2.7*10³kg/m³.

The density of iron=7.86*10³kg/m³.

The density of water=1000kg/m³.

The thermal expansion coefficient of steel: 12x10^-6(1/°C)

L_f of water =334kJ/kg; L_v of water =2256kJ/kg; specific heat of water =4186J/kg°C; specific heat of ice=2090J/kg°C; specific heat of iron=452J/kg°C

Answer 1

Given that Weight in air (Wais) = 3oon laleight in alcohol (Walcohol) = 222n fis in known sampie Vng alcohol FB Upwards ng - downwards Total force = -300 +122= -78N Fiz = Pravid Vobi 'g 78 N: Too x Vobi x 9.8 Voni 78 700 X9.8 = 0.0113m3, b) Density P = m/ Weight = ng V - 300N 300 ME 30.61 kg. 30.61 p = =2708.85 kg/m3.5 2.708x10*896} 0.0113. c) The material is aluminium, density, is cs 52.7 x.dorkolmanner