Question

The diameter of a lead ball is 2.1cm. The density of the lead used is 11.34.g/cm cube . Find the weight of the ball?

Answer 1

The weight of ball = 0.539 


--------------------------------  EXPLANATION ------------------------




radius = 1.05 cm 




r^3 = 1.157625 



4/3 pi = 4.18879 


Volume of sphere = 4/3 pi r^3 = 1.157625*4.18879 = 4.8490 cm^3 

density = mass/volume = 11.34 g/cm^3 

11.34 g/cm^3 = mass of sphere/volume of ball = mass of ball/4.8490 cm^3 
11.34*4.8490 g = 54.988 g = mass of ball 
mass*acceleration due to gravity = weight 

Converting to SI units 



                               mass of ball = 0.054988 kg 




acceleration due to gravity = 9.81 m/s^2 

weight of ball = 0.054988*9.81 = 0.539 kgm/s^2 = 0.539