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Find the torque of a force F(vector) =3i+j+5k at a point r(vector)=7i+3j+k a) 14i-38j+16k b) 4i+4j+6k c) -21i+4j+4k d) -14i+34j-16k

Find the torque of a force F(vector) =3i+j+5k at a point r(vector)=7i+3j+k
a) 14i-38j+16k
b) 4i+4j+6k 
c) -21i+4j+4k
d) -14i+34j-16k 

Grade:11

2 Answers

Arun
25750 Points
6 years ago
Dear Ishika
 
Torque = r(vector) x F(vector)
Torque = (7i +3j +k) x (3i + j +5k)
Torque = 7k -35 j -9k +15 i + 3j -i
Torque = 14 i -32 j -2k
 
Options are wrong according to the data in the question.
 
Regards
Arun (askIITians forum expert)
Shashwat singh
13 Points
5 years ago
D is the correct option. 
If we take i cap and k cap as negative and j cap as positive. 
Then answer will be b

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