009 10.0 points A cylinder 19 cm long and 8 cm in radius is made of two differen

Question

009 10.0 points A cylinder 19 cm long and 8 cm in radius is made of two different metals bonded end-to end to make a single bar. The densities are 4.9 g/cm3 and 6.1 g/cm 8 cm radius What length of the lighter-density part of the bar is needed if the total mass is 20552 g? Answer in units of cm 010 10.0 points A sphere of metal has a radius of 6.8 cm and a density of 8.99 g/cm3. What is the mass of the sphere? Answer in units of g 011 (part 1 of 2) 10.0 points Fine grains of beach sand are assumed to be spheres of radius 382 m. These grains are made of silicon dioxide which has a density of 2600 kg/m1

Explanation / Answer

Q10.

Density = Mass/Volume

given that

density = 8.99 gm/cm^3

Volume = 4*pi*r^3/3

r = 6.8 cm

Volume = 4*pi*6.8^3/3 = 1317.09 cm^3

So,

Mass = Volume*density

Mass = 1317.09*8.99 = 11840.64 gm

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