1. The total work done on a particle by a constant force F = (21+ 3j + 4k ) Nover a
displacement s = ( 5i + 7j + zk )m is zero. Find the value of z.
Answers
Answered by
0
Explanation:
The position vector of two points (−1,2,1) and (2,−3,1)
r
=(2+1)
i
^
+(−3−2)
j
^
+(1−1)
k
^
r
=(3
i
^
−5
j
^
+0
k
^
)m
F
=(
i
^
+3
j
^
+4
k
^
)N
The work done by the force,
W=
F
.
r
W=(
i
^
+3
j
^
+4
k
^
).(3
i
^
−5
j
^
+0
k
^
)
W=1×3+3×(−5)+4×0
W=3−15=−12J
The correct option is C.
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