Question

A force F = ai +39 +6K is acting at a point
P = 2î -6-12Ń. Find the value of a for which
angular momentum about origin is conserved.
(1) 0
(2) 1
13 - 1
(4) 2​

Answer 1

Answer:

in ur question F should be ,F= ai+3j +6k

and ans will be a= -1

Explanation:

For angular momentum conservation r×F =0

•°• i(-36+36) - j(12+12a) +k(6+6a)=0

•°• 12+12a=0

12a=-12

a=-1........ answer