1. What is the angle between force F=3i +4j-5k unit and displacement Š = 4j + 3k unit?
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Answer:
F.d=Fdcosθ
⟹cosθ=FdF.d=5015+16+15=5046
⟹θ=cos−10.92
Projection of F on d is given by
dF.d
=52+42+3215+16+15
=5246
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