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Question
Physics
A particle moves from position 3 hati+2 hatj-6 hatk to 14 hati+13 hatj+9 hatk due to a uniform force of (4 hati+ hatj+3 hatk) N. If the displacement. In metre then work done will be
Q. A particle moves from position
3
i
^
+
2
j
^
−
6
k
^
to
14
i
^
+
13
j
^
+
9
k
^
due to a uniform force of
(
4
i
^
+
j
^
+
3
k
^
)
N
. If the displacement. In metre then work done will be
961
162
Work, Energy and Power
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A
300 J
8%
B
250 J
15%
C
100 J
65%
D
0
12%
Solution:
S
=
r
2
−
r
1
=
(
14
i
^
+
13
j
^
+
9
k
^
)
−
(
3
i
^
+
2
j
^
−
6
k
^
)
W
=
F
⋅
S
=
(
4
i
^
+
j
^
+
3
k
^
)
⋅
(
11
i
^
+
11
j
^
+
15
k
^
)
=
4
×
11
+
1
×
11
+
3
×
15
=
100
J