F=2i-3j N and r=3i=2j m then torque

F=2i-3j N and r=3i=2j m then torque

Grade:Upto college level

2 Answers

AKASH GOYAL AskiitiansExpert-IITD
420 Points
13 years ago

Dear Lalshekar

Torque= r x F

         = (3i + 2j) X (2i - 3j)

         = 6 i X i - 9 i x j + 4 j x i - 6 j x j

         = 0 - 9k + 4 (-k) - 0

         = -13k  Nm   Answer

All the best


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vikas askiitian expert
509 Points
13 years ago

Torque=cross product of force and displacement vector



     ={ 6i*i - 9i*j + 4j*i - 6j*j}              

     i*i=j*j=0     and i*j=k, j*i=-k


   *represents cross product                        

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