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

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: