A small sphere of mass 
is dropped from a great height. After it has fallen 
, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 
of fall is
a)
Greater than the work done by air friction in the second 
b)
Less than the work done by air friction in the second 
c)
Equal to 
d)
Greater than 
A small sphere of mass is dropped from a great height. After it has fallen , it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first of fall is
a)
Greater than the work done by air friction in the second
b)
Less than the work done by air friction in the second
c)
Equal to
d)
Greater than
Question ID - 57381 | SaraNextGen Top Answer
A small sphere of mass is dropped from a great height. After it has fallen , it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first of fall is
a)
Greater than the work done by air friction in the second
b)
Less than the work done by air friction in the second
c)
Equal to
d)
Greater than
|
A small sphere of mass |
|
|
a) |
Greater than the work done by air friction in the second |
|
b) |
Less than the work done by air friction in the second |
|
c) |
Equal to |
|
d) |
Greater than |
|
(b) In the first Hence work done against air friction in the first |
body starts from rest and its velocity goes on increasing and after 
it acquire maximum velocity (terminal velocity). Further, air friction 
viscous force which is proportional to velocity is low in the beginning and maximum at 
is less than the work done in next 