Work done by the force 3i-4j+5k for a displacement of metre 2i+4j+2k, will be :
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Work done by the force 3i-4j+5k for a displacement of metre 2i+4j+2k, will be :
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Answer:
F
=3
i
^
+9
j
^
+5
k
^
displacement vector
b
=(7−3)
i
^
+(2−4)
j
^
+(5−6)
k
^
d
=4
i
^
−2
j
^
−
k
^
so work W=
F
.
d
=3(4)+(−4)(−2)+5(−1)
or
W=12+8−5=15 unit
F
=3
i
^
+9
j
^
+5
k
^
displacement vector
b
=(7−3)
i
^
+(2−4)
j
^
+(5−6)
k
^
d
=4
i
^
−2
j
^
−
k
^
so work W=
F
.
d
=3(4)+(−4)(−2)+5(−1)
or
W=12+8−5=15 unit