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Byju's Answer
Standard X
Physics
Rotational Power
The angular v...
Question
The angular velocity of a body is
→
ω
=
2
ˆ
i
+
3
ˆ
j
+
4
ˆ
k
and a torque
→
τ
=
ˆ
i
+
2
ˆ
j
+
3
ˆ
k
acts on it. The
rotational power will be
A
20 W
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B
15 W
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C
√
17
W
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D
√
14
W
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Solution
The correct option is
A
20 W
Power
(
P
)
=
→
τ
.
→
ω
=
(
i
+
2
ˆ
j
+
3
ˆ
k
)
.
(
2
ˆ
i
+
3
ˆ
j
+
4
ˆ
k
)
=
2
+
6
+
12
=
20
W
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