Year: 2023
Topic: Thermal properties of matter
Time :
1. The viscous drag acting on a metal sphere of diameter 1 mm, falling through a fluid of viscosity 0.8 Pa s with a velocity of 2m s
−1
is equal to :
(1). \(15×10^{−3}N\)
(2). \(30×10^{−3}N\)
(3). \(1.5×10^{−3}N\)
(4). \(20×10^{−3}N\)