Question
⃗F=3^i+6^j−8^k
⃗s=−2^i+5^j+2^k
If W =⃗F.⃗s find W.
⃗s=−2^i+5^j+2^k
If W =⃗F.⃗s find W.
Answer: Option A
:
A
⃗F=3^i+6^j−8^k
⃗s=−2^i+5^j+2^k
W =⃗F.⃗s
= (3^i+6^j−8^k).(−2^i+5^j+2^k)
= (-6) + (30) + (-16)
∵(^i.^i=1&^i.^j=0)
W = 8 N.m
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:
A
⃗F=3^i+6^j−8^k
⃗s=−2^i+5^j+2^k
W =⃗F.⃗s
= (3^i+6^j−8^k).(−2^i+5^j+2^k)
= (-6) + (30) + (-16)
∵(^i.^i=1&^i.^j=0)
W = 8 N.m
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