A spherical ball of radius m and density falls freely under gravity through a distance before entering a tank of water. If after entering in water the velocity of the ball does not change, then the value of is approximately
(The coefficient of viscosity of water is ) [2024]
2296 m
2249 m
2518 m
2396 m
(C) Terminal velocity,
When ball fall from height
Now
A small spherical ball of radius , falling through a viscous medium of negligible density has terminal velocity . Another ball of the same mass but of radius , falling through the same viscous medium will have terminal velocity [2024]
(A) Since density is negligible hence Buoyancy force will be negligible
At terminal velocity,
(as mass is constant)
Now,
So,
Small water droplets of radius 0.01 mm are formed in the upper atmosphere and falling with a terminal velocity of 10 cm/s. Due to condensation, if 8 such droplets are coalesced and formed a larger drop, the new terminal velocity will be _______ cm/s. [2024]
(40)