Castor oil at 20°C has a coefficient of viscosity 2.42 N. s/m2 and a density 940 kg/m². Calculate the terminal velocity of a
steel ball of radius 2.0 mm falling under gravity in the oil
taking the density of steel as 7800 kg/m3.
Ans: 0.025 m/sec
Chapter Base
Unit 1: Mechanics
1. Physical Quantities
FORMULAE
1. To find the numerical value of a system using another
system of units, we use

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

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