A raindrop of radius 0.3 mm has a terminal velocity in air =1 m s- 1 . The viscous force on it is (Given the viscosity of the air is 18 × 10- 5 g cm- 1 s- 1 )

Question

A raindrop of radius 0.3 mm has a terminal velocity in air =1 m s- 1 . The viscous force on it is (Given the viscosity of the air is 18 × 10- 5 g cm- 1 s- 1 ) (A) 101.73× 10- 4 dyne (B) 101.73× 10- 5 dyne (C) 16.95× 10- 4 dyne (D) 16.95× 10- 5 dyne

Tardigrade Admin · Accepted Answer

F=6 π η r v =6× 3.14× (.18× (10)- 5.)× 0.03× 100 =101.73× 10- 4 dyne

Q. A raindrop of radius 0.3 mm has a terminal velocity in air $= 1 m s^{- 1}$ . The viscous force on it is (Given the viscosity of the air is $18 \times 1 0^{- 5} g c m^{- 1} s^{- 1}$ )

$101.73 \times 1 0^{- 4} d y n e$

$101.73 \times 1 0^{- 5} d y n e$

$16.95 \times 1 0^{- 4} d y n e$

$16.95 \times 1 0^{- 5} d y n e$

$F = 6 π η r v$
$= 6 \times 3.14 \times (18 \times (10)^{- 5}) \times 0.03 \times 100$
$= 101.73 \times 1 0^{- 4} d y n e$

Q. A raindrop of radius 0.3 mm has a terminal velocity in air =1ms−1 . The viscous force on it is (Given the viscosity of the air is 18×10−5gcm−1s−1 )

101.73×10−4dyne

101.73×10−5dyne

16.95×10−4dyne

16.95×10−5dyne