1.

Find the work done by force, F = 8i - 6j + 9k move from to

Answer»

ANSWER:

work \: done = f.ds \\  = (8i  -  6j + 9k).(6i + 2j + 12k) \\  = 48  - 12 + 108 \\  = 36 +  108 \\  =  \:  \:  144 \:  \: joules \\  \\

EXPLANATION:

f = 8i  - 6j + 9k \\  \\ ds = (6 - 0)i + (12 -1 0) j+ (20 - 8)k \\  \\ ds = 6i + 2j + 12k \\  \\ work \: done = f.ds \\  = (8i  -  6j + 9k).(6i + 2j + 12k) \\  = 48  - 12 + 108 \\  = 36 +  108 \\  =  \:  \:  144 \:  \: joules \\  \\



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