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Byju's Answer
Standard XII
Physics
Introduction
A force F⃗ ...
Question
A force
→
F
=
(
5
^
i
+
4
^
j
)
N
displaces the body by
→
s
=
(
3
^
i
+
5
^
k
)
m
in
3
s
.
Power generated will be
A
11
W
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B
6
W
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C
5
W
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D
12
W
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Solution
The correct option is
C
5
W
F
=
(
5
ˆ
i
+
4
ˆ
j
)
=
(
5
ˆ
i
+
4
ˆ
j
+
0
ˆ
k
)
s
=
(
3
ˆ
i
+
4
ˆ
j
)
=
(
3
ˆ
i
+
0
ˆ
j
+
4
ˆ
k
)
Work done
(
w
)
=
f
.
s
=
(
5
ˆ
i
+
4
ˆ
j
+
0
ˆ
k
)
.
(
3
ˆ
i
+
0
ˆ
j
+
4
ˆ
k
)
=
(
5
×
3
)
+
(
4
×
0
)
+
(
0
×
4
)
=
15
J
So,
w
=
15
J
Power
(
p
)
=
w
t
=
15
J
3
sec
=
5
J
/
s
=
5
w
a
t
t
∴
The power is
5
watt.
Suggest Corrections
0
Similar questions
Q.
A force
→
F
=
(
5
^
i
+
4
^
j
)
N
acts on a body and produced a displacement
→
S
=
(
6
^
i
−
5
^
j
+
3
^
k
)
m
. The work done will be
Q.
If
→
F
=
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^
i
+
3
^
j
+
4
^
k
acts on a body and displaces it by
→
S
=
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^
i
+
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^
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, then the work done by the force is:
Q.
If force
→
F
=
5
^
i
+
3
^
k
j
+
4
^
k
makes a displacement of
→
s
=
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^
i
−
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Q.
A force of
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^
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+
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^
j
+
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acts on a body for 4 s and produces a displacement of
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i
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^
j
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^
k
m
calculate the power ?
Q.
A force
→
F
=
(
3
^
i
+
4
^
j
)
N
acts on
2
k
g
movable object that moves from an initial position
→
r
1
=
(
−
3
^
i
−
2
^
j
)
m
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→
r
1
=
(
5
^
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