1) 1) a block of wood has specific gravity 0.79. When placed in water, what perc

Question

1)      1) a block of wood has specific gravity 0.79. When placed in water, what percent of the volume of the wood is under the surface. And what volume of the wood is above the surface?

2)      2) Legend says that Archimedes, in determining whether or not the king%u2019s crown was made of pure gold, measured its volume by the water displacement method. If the density of gold is 19.3 g/cm^3, what volume would be necessary to prove that it is pure gold?

3)      3) A block of wood has a density of 0.55g/cm^3 and mass of 2,500 g. it floats in a container of oil (the oil%u2019s density is 0.85 g/cm^3). What volume of oil does the wood displace?

4)      4) The bulks modulus of a material, as a meaningful physical property, is applicable to which phases?

5)      5) By what factor is the total pressure greater at a depth of 750 m in water than at the surface where pressure is one atmosphere? (water density: 1.0 * 10^3 kg/m^3, 1 atmosphere pressure: 1.01 *10^5 N/m^3 and g= 9.8m/s^2).

Explanation / Answer

a)percent =1-p wood/pwater *100

=100-79%

=21 %

below the surface=79%

b)volume = mass*density

=mass*19.3 cm^3

c)volume of oil displaced be V.so,

2.5*9.8=850*v*9.8

or v=2.941*10^-3 m^3

d)it is applicable to fluids only (i.e. liquids and gases)

e)let the factor be x.so,

x=(750*9.8*1000)/(1.01*10^5)

=72.77

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