Question

the diameter of a lead ball is 2.1 CM the density of a lead is used is 11.34 gram per centimetre cube what is the weight of a ball

Answer 1

Solution:-
Given : Diameter of the ball = 2.1 cm or radius = 2.1/2 = 1.05 cm
Volume of the Spherical lead ball = 4/3πr³
= 4/3*22/7*1.05*1.05*1.05
Volume of the lead ball = 4.851 cu cm
Lead used for making lead ball = 11.34 g/cu cm
So, the weight of the lead ball = 11.34 × 4.851
Weight of the lead ball = 55.01 grams

Answer 2

hey there.


solution=>

given: diameter= 2.1cm, radius= diameter/2= 2.1/2= 11.50cm

we have, volume of sphere(since it is mentioned that there is lead ball)

= 4/3πr^3

4/3×3.14×11.5×11.5×11.5= 6367.396cm^3


density= 11.34gm/cm^3

we have ,,
(in maths)
density= mass / volume

mass= density× volume

mass = 11.34× 6367.396

mass= 72,206.2706g

in terms of kg

mass(or) weight= 72.206kg

(in physics)

we refer weight as

W= mass × gravity

= 72.906kg× 9.8

= 707.621 kgms^-2


⏩⏩hope it helps