Question

The diameter of a lead ball is2.1cm.the density of the lead used is 11.34g/c.what is the weight of the ball

Answer 1

Solution:-

Diameter of the lead ball = 2.1 cm 
So, radius = 2.1/2 = 1.05 cm
Volume of the lead ball = 4/3πr³
= 4/3*22/7*1.05*1.05*1.05
= 101.871/21
Volume = 4.851 cu cm

Now,
Density = Mass/Volume
11.34 = Mass/4.851
Mass = 11.34*4.851
Mass = 55.01034 grams  or 0.05501034 kg
Weight of the lead ball = Mass*Acceleration due to gravity
Acceleration due to gravity = 9.81 m/s^2
Weight of the lead ball = 0.05501034*9.81
Weight = 0.5396514354
Or 0.54 N (Approximately)
Answer.