Nid help!?????????

Question

show me your solution please:

•a cube measure 5.00 cm on side. If its mass is 80.0 g,what is density?

•a spherical solid has a radius of 1.24 cm . If its density is 5.20 g/cm cube what is mass?

Answer 1

Solving For Density

1)

d = m/v

Conversions:

m = 80g =  0.08   kg

v = 125 cm^3 = 0.000125   m^3

---> d = (0.08 kg)/(0.000125 m^3)

       d = 640  kg/m^3

2) d=m/v => m=dv

volume of square: v = 4/3(pi)(r^3)

                                  = 7.9864 cm^3

conversions

d = 5.2   g/cm^3 = 5200 kg/m^3

v = 7.9864 cm^3 = 7.9864E-06   m^3

-> m=dv

     m=(5200 kg/m^3)(7.9864E-06 m^3)

     m=0.04152928 kg

Answer 2

density = mass/volume

volume = 5^3 = 125 cm^3

density = 80/125 = 0.64 g/cc

2) r = 1.24

density = 5.2 g/cc

V = (4/3) pi r^3 = 4/3 (3.14)(1.24)^3

V = 8.0 cm^3

density = mass/volume

mass  = density* volume

mass = 5.2(8.0) = 41.6 g

Answer 3

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