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OpenStudy (anonymous):
A constant force F = 1i - 7j +7k moves an object along a straight line from point (2,7,-5) to point (5,3,-10). Find the work done if the distance is measured in meters and the magnitude of the force is measured in newtons.
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OpenStudy (anonymous):
F= 1i - 7j + 7k W=F.S W=(1i - 7j + 7k)(3i -4j -5k) W= 3 + 28 -35
OpenStudy (anonymous):
W= -4 Nm
OpenStudy (anonymous):
oh that's all...don't have to use the cross product?
OpenStudy (anonymous):
No...Work is Scalar No Cross Product ....Dot Product is what we need here
OpenStudy (anonymous):
well then duh..that was simple
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OpenStudy (anonymous):
Yesh!
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