When 
is the angle between the surface and force applied, then which of the following pair is correct?
A
is negative B
is zero C
is positive D
1 Joule 
Text Solution
Verified by ExpertsThe correct answer is:
B
When angle 
from between surface and force applied is acute 
, then work done 
is positive. Hence, incorrect.
When 
is equal to 
. Hence, work done 
is zero. Hence, correct.
When 
is obtuse 
, then 
is negative. Hence, incorrect.
SI unit of 
is joule and CGS unit is erg and hence, 1 joule 
erg. Hence, incorrect.
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